1977572940 has 384 divisors, whose sum is σ = 7023034368. Its totient is φ = 405565440.

The previous prime is 1977572917. The next prime is 1977573001. The reversal of 1977572940 is 492757791.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 23826139 + ... + 23826221.

It is an arithmetic number, because the mean of its divisors is an integer number (18289152).

Almost surely, 2^1977572940 is an apocalyptic number.

1977572940 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 1977572940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3511517184).

1977572940 is an abundant number, since it is smaller than the sum of its proper divisors (5045461428).

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

1977572940 is a wasteful number, since it uses less digits than its factorization.

1977572940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237 (or 235 counting only the distinct ones).

The product of its (nonzero) digits is 1111320, while the sum is 51.

The square root of 1977572940 is about 44469.9105013716. The cubic root of 1977572940 is about 1255.1939489569.

The spelling of 1977572940 in words is "one billion, nine hundred seventy-seven million, five hundred seventy-two thousand, nine hundred forty".