1976997240 has 128 divisors (see below), whose sum is σ = 6743404800. Its totient is φ = 514926720.

The previous prime is 1976997221. The next prime is 1976997307. The reversal of 1976997240 is 427996791.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25155 + ... + 67725.

It is an arithmetic number, because the mean of its divisors is an integer number (52682850).

Almost surely, 2^1976997240 is an apocalyptic number.

1976997240 is a gapful number since it is divisible by the number (10) 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 1976997240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3371702400).

1976997240 is an abundant number, since it is smaller than the sum of its proper divisors (4766407560).

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

1976997240 is a wasteful number, since it uses less digits than its factorization.

1976997240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42634 (or 42624 counting only the distinct ones).

The product of its (nonzero) digits is 1714608, while the sum is 54.

The square root of 1976997240 is about 44463.4371141053. The cubic root of 1976997240 is about 1255.0721354494.

The spelling of 1976997240 in words is "one billion, nine hundred seventy-six million, nine hundred ninety-seven thousand, two hundred forty".