1857538409940 has 72 divisors (see below), whose sum is σ = 5635414199688. Its totient is φ = 495266123520.

The previous prime is 1857538409897. The next prime is 1857538409977. The reversal of 1857538409940 is 499048357581.

1857538409940 is a `hidden beast` number, since 1 + 8 + 5 + 7 + 538 + 4 + 0 + 9 + 94 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 257864902416 + 1599673507524 = 507804^2 + 1264782^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 352194 + ... + 1959366.

Almost surely, 2^{1857538409940} is an apocalyptic number.

1857538409940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1857538409940 is an abundant number, since it is smaller than the sum of its proper divisors (3777875789748).

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

1857538409940 is a wasteful number, since it uses less digits than its factorization.

1857538409940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1613609 (or 1613604 counting only the distinct ones).

The product of its (nonzero) digits is 43545600, while the sum is 63.

The spelling of 1857538409940 in words is "one trillion, eight hundred fifty-seven billion, five hundred thirty-eight million, four hundred nine thousand, nine hundred forty".