31868138 has 8 divisors (see below), whose sum is σ = 47833632. Its totient is φ = 15923596.

The previous prime is 31868101. The next prime is 31868171. The reversal of 31868138 is 83186813.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620 + ... + 8007.

It is an arithmetic number, because the mean of its divisors is an integer number (5979204).

Almost surely, 2^31868138 is an apocalyptic number.

31868138 is a deficient number, since it is larger than the sum of its proper divisors (15965494).

31868138 is a wasteful number, since it uses less digits than its factorization.

31868138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10476.

The product of its digits is 27648, while the sum is 38.

The square root of 31868138 is about 5645.1871536735. The cubic root of 31868138 is about 317.0435311255.

The spelling of 31868138 in words is "thirty-one million, eight hundred sixty-eight thousand, one hundred thirty-eight".