1957383440 has 20 divisors (see below), whose sum is σ = 4550916684. Its totient is φ = 782953344.

The previous prime is 1957383403. The next prime is 1957383457. The reversal of 1957383440 is 443837591.

It can be written as a sum of positive squares in 2 ways, for example, as 582160384 + 1375223056 = 24128^2 + 37084^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1957383391 and 1957383400.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12233567 + ... + 12233726.

Almost surely, 2^1957383440 is an apocalyptic number.

1957383440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1957383440 is an abundant number, since it is smaller than the sum of its proper divisors (2593533244).

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

1957383440 is a wasteful number, since it uses less digits than its factorization.

1957383440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24467306 (or 24467300 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 1957383440 is about 44242.3263402819. The cubic root of 1957383440 is about 1250.9078077485.

The spelling of 1957383440 in words is "one billion, nine hundred fifty-seven million, three hundred eighty-three thousand, four hundred forty".