172972867 has 4 divisors (see below), whose sum is σ = 176236560. Its totient is φ = 169709176.

The previous prime is 172972859. The next prime is 172972871. The reversal of 172972867 is 768279271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 768279271 = 139 ⋅5527189.

It is a cyclic number.

It is not a de Polignac number, because 172972867 - 2³ = 172972859 is a prime.

It is a super-2 number, since 2×172972867² = 59839225436399378, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172972867.

It is not an unprimeable number, because it can be changed into a prime (172972367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1631767 + ... + 1631872.

It is an arithmetic number, because the mean of its divisors is an integer number (44059140).

Almost surely, 2^172972867 is an apocalyptic number.

172972867 is a deficient number, since it is larger than the sum of its proper divisors (3263693).

172972867 is an equidigital number, since it uses as much as digits as its factorization.

172972867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3263692.

The product of its digits is 592704, while the sum is 49.

The square root of 172972867 is about 13151.9149556253. The cubic root of 172972867 is about 557.1763336730.

It can be divided in two parts, 17297 and 2867, that added together give a square (20164 = 142²).

The spelling of 172972867 in words is "one hundred seventy-two million, nine hundred seventy-two thousand, eight hundred sixty-seven".