172206379 has 8 divisors (see below), whose sum is σ = 188624160. Its totient is φ = 156487296.

The previous prime is 172206361. The next prime is 172206389. The reversal of 172206379 is 973602271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172206379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172206319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174159 + ... + 175144.

It is an arithmetic number, because the mean of its divisors is an integer number (23578020).

Almost surely, 2^172206379 is an apocalyptic number.

172206379 is a deficient number, since it is larger than the sum of its proper divisors (16417781).

172206379 is a wasteful number, since it uses less digits than its factorization.

172206379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349349.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 172206379 is about 13122.7428154331. The cubic root of 172206379 is about 556.3521170262.

The spelling of 172206379 in words is "one hundred seventy-two million, two hundred six thousand, three hundred seventy-nine".