172015238 has 4 divisors (see below), whose sum is σ = 258022860. Its totient is φ = 86007618.

The previous prime is 172015201. The next prime is 172015273. The reversal of 172015238 is 832510271.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 172015238.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43003808 + ... + 43003811.

It is an arithmetic number, because the mean of its divisors is an integer number (64505715).

Almost surely, 2^172015238 is an apocalyptic number.

172015238 is a deficient number, since it is larger than the sum of its proper divisors (86007622).

172015238 is an equidigital number, since it uses as much as digits as its factorization.

172015238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86007621.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 172015238 is about 13115.4579790414. The cubic root of 172015238 is about 556.1461992399.

The spelling of 172015238 in words is "one hundred seventy-two million, fifteen thousand, two hundred thirty-eight".