99431378 has 8 divisors (see below), whose sum is σ = 149252220. Its totient is φ = 49680640.

The previous prime is 99431363. The next prime is 99431393. The reversal of 99431378 is 87313499.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (99431363) and next prime (99431393).

It can be written as a sum of positive squares in 2 ways, for example, as 90687529 + 8743849 = 9523^2 + 2957^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 13823 + ... + 19746.

Almost surely, 2^99431378 is an apocalyptic number.

99431378 is a deficient number, since it is larger than the sum of its proper divisors (49820842).

99431378 is a wasteful number, since it uses less digits than its factorization.

99431378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35052.

The product of its digits is 163296, while the sum is 44.

The square root of 99431378 is about 9971.5283683094. The cubic root of 99431378 is about 463.2774407100.

The spelling of 99431378 in words is "ninety-nine million, four hundred thirty-one thousand, three hundred seventy-eight".