31669138 has 16 divisors (see below), whose sum is σ = 48825504. Its totient is φ = 15396640.

The previous prime is 31669103. The next prime is 31669139. The reversal of 31669138 is 83196613.

It is a junction number, because it is equal to n+sod(n) for n = 31669097 and 31669106.

It is not an unprimeable number, because it can be changed into a prime (31669139) 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, 37881 + ... + 38707.

It is an arithmetic number, because the mean of its divisors is an integer number (3051594).

Almost surely, 2^31669138 is an apocalyptic number.

31669138 is a deficient number, since it is larger than the sum of its proper divisors (17156366).

31669138 is a wasteful number, since it uses less digits than its factorization.

31669138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337.

The product of its digits is 23328, while the sum is 37.

The square root of 31669138 is about 5627.5339181563. The cubic root of 31669138 is about 316.3822285512.

The spelling of 31669138 in words is "thirty-one million, six hundred sixty-nine thousand, one hundred thirty-eight".