1973978496 has 384 divisors, whose sum is σ = 7026739200. Its totient is φ = 519450624.

The previous prime is 1973978491. The next prime is 1973978509. The reversal of 1973978496 is 6948793791.

1973978496 is a `hidden beast` number, since 1 + 9 + 73 + 9 + 78 + 496 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a super-2 number, since 2×1973978496² = 7793182205340844032, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1973978491) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5378505 + ... + 5378871.

It is an arithmetic number, because the mean of its divisors is an integer number (18298800).

Almost surely, 2^1973978496 is an apocalyptic number.

1973978496 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1973978496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3513369600).

1973978496 is an abundant number, since it is smaller than the sum of its proper divisors (5052760704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1973978496 is a wasteful number, since it uses less digits than its factorization.

1973978496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446 (or 431 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 63.

The square root of 1973978496 is about 44429.4777822112. The cubic root of 1973978496 is about 1254.4330059950.

The spelling of 1973978496 in words is "one billion, nine hundred seventy-three million, nine hundred seventy-eight thousand, four hundred ninety-six".