31906146 has 16 divisors (see below), whose sum is σ = 63869184. Its totient is φ = 10625904.

The previous prime is 31906141. The next prime is 31906157. The reversal of 31906146 is 64160913.

It is not an unprimeable number, because it can be changed into a prime (31906141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9480 + ... + 12396.

It is an arithmetic number, because the mean of its divisors is an integer number (3991824).

Almost surely, 2^31906146 is an apocalyptic number.

31906146 is an abundant number, since it is smaller than the sum of its proper divisors (31963038).

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

31906146 is a wasteful number, since it uses less digits than its factorization.

31906146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4745.

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

The square root of 31906146 is about 5648.5525579568. The cubic root of 31906146 is about 317.1695232485.

The spelling of 31906146 in words is "thirty-one million, nine hundred six thousand, one hundred forty-six".