899644431 has 16 divisors (see below), whose sum is σ = 1377851904. Its totient is φ = 511470624.

The previous prime is 899644423. The next prime is 899644469. The reversal of 899644431 is 134446998.

It is a happy number.

It is not a de Polignac number, because 899644431 - 2³ = 899644423 is a prime.

It is a super-2 number, since 2×899644431² = 1618720204458627522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (899644231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104595 + ... + 112868.

It is an arithmetic number, because the mean of its divisors is an integer number (86115744).

Almost surely, 2^899644431 is an apocalyptic number.

899644431 is a deficient number, since it is larger than the sum of its proper divisors (478207473).

899644431 is a wasteful number, since it uses less digits than its factorization.

899644431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217670.

The product of its digits is 746496, while the sum is 48.

The square root of 899644431 is about 29994.0732645635. The cubic root of 899644431 is about 965.3622204150.

It can be divided in two parts, 89964 and 4431, that added together give a triangular number (94395 = T₄₃₄).

The spelling of 899644431 in words is "eight hundred ninety-nine million, six hundred forty-four thousand, four hundred thirty-one".