1860400644 has 48 divisors (see below), whose sum is σ = 4744567296. Its totient is φ = 564825600.

The previous prime is 1860400639. The next prime is 1860400651. The reversal of 1860400644 is 4460040681.

1860400644 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1860400644² = 6922181112391229472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140767 + ... + 153414.

It is an arithmetic number, because the mean of its divisors is an integer number (98845152).

Almost surely, 2^1860400644 is an apocalyptic number.

It is an amenable number.

1860400644 is an abundant number, since it is smaller than the sum of its proper divisors (2884166652).

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

1860400644 is a wasteful number, since it uses less digits than its factorization.

1860400644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294236 (or 294234 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 1860400644 is about 43132.3619107510. The cubic root of 1860400644 is about 1229.8972404073.

The spelling of 1860400644 in words is "one billion, eight hundred sixty million, four hundred thousand, six hundred forty-four".