99931906 has 8 divisors (see below), whose sum is σ = 157787280. Its totient is φ = 47336148.

The previous prime is 99931903. The next prime is 99931943. The reversal of 99931906 is 60913999.

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

It is not an unprimeable number, because it can be changed into a prime (99931903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1314856 + ... + 1314931.

It is an arithmetic number, because the mean of its divisors is an integer number (19723410).

Almost surely, 2^99931906 is an apocalyptic number.

99931906 is a deficient number, since it is larger than the sum of its proper divisors (57855374).

99931906 is a wasteful number, since it uses less digits than its factorization.

99931906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2629808.

The product of its (nonzero) digits is 118098, while the sum is 46.

The square root of 99931906 is about 9996.5947202035. The cubic root of 99931906 is about 464.0535046555.

The spelling of 99931906 in words is "ninety-nine million, nine hundred thirty-one thousand, nine hundred six".