172408919 has 8 divisors (see below), whose sum is σ = 175816992. Its totient is φ = 169034400.

The previous prime is 172408903. The next prime is 172408939. The reversal of 172408919 is 919804271.

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

It is a cyclic number.

It is not a de Polignac number, because 172408919 - 2⁴ = 172408903 is a prime.

It is a super-2 number, since 2×172408919² = 59449670701497122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172408939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2117 + ... + 18689.

It is an arithmetic number, because the mean of its divisors is an integer number (21977124).

Almost surely, 2^172408919 is an apocalyptic number.

172408919 is a deficient number, since it is larger than the sum of its proper divisors (3408073).

172408919 is a wasteful number, since it uses less digits than its factorization.

172408919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16777.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 172408919 is about 13130.4576843307. The cubic root of 172408919 is about 556.5701488432.

The spelling of 172408919 in words is "one hundred seventy-two million, four hundred eight thousand, nine hundred nineteen".