1977197040 has 600 divisors, whose sum is σ = 8620698240. Its totient is φ = 416295936.

The previous prime is 1977197011. The next prime is 1977197051. The reversal of 1977197040 is 407917791.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 4127521 + ... + 4127999.

Almost surely, 2^1977197040 is an apocalyptic number.

1977197040 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 1977197040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4310349120).

1977197040 is an abundant number, since it is smaller than the sum of its proper divisors (6643501200).

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

1977197040 is a wasteful number, since it uses less digits than its factorization.

1977197040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531 (or 509 counting only the distinct ones).

The product of its (nonzero) digits is 111132, while the sum is 45.

The square root of 1977197040 is about 44465.6838472096. The cubic root of 1977197040 is about 1255.1144142077.

The spelling of 1977197040 in words is "one billion, nine hundred seventy-seven million, one hundred ninety-seven thousand, forty".