172439998 has 4 divisors (see below), whose sum is σ = 258660000. Its totient is φ = 86219998.

The previous prime is 172439989. The next prime is 172440013. The reversal of 172439998 is 899934271.

It is a happy number.

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

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, 43109998 + ... + 43110001.

It is an arithmetic number, because the mean of its divisors is an integer number (64665000).

Almost surely, 2^172439998 is an apocalyptic number.

172439998 is a deficient number, since it is larger than the sum of its proper divisors (86220002).

172439998 is an equidigital number, since it uses as much as digits as its factorization.

172439998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86220001.

The product of its digits is 979776, while the sum is 52.

The square root of 172439998 is about 13131.6411007916. The cubic root of 172439998 is about 556.6035898904.

The spelling of 172439998 in words is "one hundred seventy-two million, four hundred thirty-nine thousand, nine hundred ninety-eight".