1974787640 has 32 divisors (see below), whose sum is σ = 5078026080. Its totient is φ = 677069952.

The previous prime is 1974787603. The next prime is 1974787651. The reversal of 1974787640 is 467874791.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3526127 + ... + 3526686.

It is an arithmetic number, because the mean of its divisors is an integer number (158688315).

Almost surely, 2^1974787640 is an apocalyptic number.

1974787640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1974787640 is an abundant number, since it is smaller than the sum of its proper divisors (3103238440).

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

1974787640 is a wasteful number, since it uses less digits than its factorization.

1974787640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7052831 (or 7052827 counting only the distinct ones).

The product of its (nonzero) digits is 2370816, while the sum is 53.

The square root of 1974787640 is about 44438.5827856830. The cubic root of 1974787640 is about 1254.6043821079.

The spelling of 1974787640 in words is "one billion, nine hundred seventy-four million, seven hundred eighty-seven thousand, six hundred forty".