138215492 has 12 divisors (see below), whose sum is σ = 242195436. Its totient is φ = 69016800.

The previous prime is 138215489. The next prime is 138215509. The reversal of 138215492 is 294512831.

It can be written as a sum of positive squares in 2 ways, for example, as 2353156 + 135862336 = 1534^2 + 11656^2 .

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

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, 19259 + ... + 25442.

It is an arithmetic number, because the mean of its divisors is an integer number (20182953).

Almost surely, 2^138215492 is an apocalyptic number.

It is an amenable number.

138215492 is a deficient number, since it is larger than the sum of its proper divisors (103979944).

138215492 is a wasteful number, since it uses less digits than its factorization.

138215492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45478 (or 45476 counting only the distinct ones).

The product of its digits is 17280, while the sum is 35.

The square root of 138215492 is about 11756.5084952974. The cubic root of 138215492 is about 517.0337677338.

The spelling of 138215492 in words is "one hundred thirty-eight million, two hundred fifteen thousand, four hundred ninety-two".