840992644 has 12 divisors (see below), whose sum is σ = 1474690000. Its totient is φ = 419652648.

The previous prime is 840992627. The next prime is 840992681. The reversal of 840992644 is 446299048.

It is a super-2 number, since 2×840992644² = 1414537254524221472, which contains 22 as substring.

It is a hoax number, since the sum of its digits (46) 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 = 840992594 and 840992603.

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, 208674 + ... + 212665.

Almost surely, 2^840992644 is an apocalyptic number.

It is an amenable number.

840992644 is a deficient number, since it is larger than the sum of its proper divisors (633697356).

840992644 is a wasteful number, since it uses less digits than its factorization.

840992644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421842 (or 421840 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 46.

The square root of 840992644 is about 28999.8731721365. The cubic root of 840992644 is about 943.9103156803.

The spelling of 840992644 in words is "eight hundred forty million, nine hundred ninety-two thousand, six hundred forty-four".