899644438 has 48 divisors (see below), whose sum is σ = 1753748640. Its totient is φ = 338405760.

The previous prime is 899644423. The next prime is 899644469. The reversal of 899644438 is 834446998.

It is a happy number.

It is a super-2 number, since 2×899644438² = 1618720229648671688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39970 + ... + 58282.

It is an arithmetic number, because the mean of its divisors is an integer number (36536430).

Almost surely, 2^899644438 is an apocalyptic number.

899644438 is a deficient number, since it is larger than the sum of its proper divisors (854104202).

899644438 is a wasteful number, since it uses less digits than its factorization.

899644438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18373 (or 18362 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 55.

The square root of 899644438 is about 29994.0733812532. The cubic root of 899644438 is about 965.3622229188.

The spelling of 899644438 in words is "eight hundred ninety-nine million, six hundred forty-four thousand, four hundred thirty-eight".