172731402 has 12 divisors (see below), whose sum is σ = 374251410. Its totient is φ = 57577128.

The previous prime is 172731397. The next prime is 172731421. The reversal of 172731402 is 204137271.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 147841281 + 24890121 = 12159^2 + 4989^2 .

It is a super-2 number, since 2×172731402² = 59672274473771208, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4798077 + ... + 4798112.

Almost surely, 2^172731402 is an apocalyptic number.

172731402 is an abundant number, since it is smaller than the sum of its proper divisors (201520008).

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

172731402 is a wasteful number, since it uses less digits than its factorization.

172731402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9596197 (or 9596194 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 172731402 is about 13142.7319077884. The cubic root of 172731402 is about 556.9169457156.

Adding to 172731402 its reverse (204137271), we get a palindrome (376868673).

The spelling of 172731402 in words is "one hundred seventy-two million, seven hundred thirty-one thousand, four hundred two".