99431400 has 48 divisors (see below), whose sum is σ = 308239200. Its totient is φ = 26514880.

The previous prime is 99431399. The next prime is 99431411. The reversal of 99431400 is 413499.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82260 + ... + 83459.

It is an arithmetic number, because the mean of its divisors is an integer number (6421650).

Almost surely, 2^99431400 is an apocalyptic number.

It is an amenable number.

99431400 is an abundant number, since it is smaller than the sum of its proper divisors (208807800).

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

99431400 is a wasteful number, since it uses less digits than its factorization.

99431400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165738 (or 165729 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 99431400 is about 9971.5294714502. The cubic root of 99431400 is about 463.2774748779.

Adding to 99431400 its reverse (413499), we get a palindrome (99844899).

The spelling of 99431400 in words is "ninety-nine million, four hundred thirty-one thousand, four hundred".