172408399 has 4 divisors (see below), whose sum is σ = 172604536. Its totient is φ = 172212264.

The previous prime is 172408381. The next prime is 172408409. The reversal of 172408399 is 993804271.

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

It is a cyclic number.

It is not a de Polignac number, because 172408399 - 2²¹ = 170311247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172408319) 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, 96744 + ... + 98509.

It is an arithmetic number, because the mean of its divisors is an integer number (43151134).

Almost surely, 2^172408399 is an apocalyptic number.

172408399 is a deficient number, since it is larger than the sum of its proper divisors (196137).

172408399 is an equidigital number, since it uses as much as digits as its factorization.

172408399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196136.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 172408399 is about 13130.4378830258. The cubic root of 172408399 is about 556.5695892883.

The spelling of 172408399 in words is "one hundred seventy-two million, four hundred eight thousand, three hundred ninety-nine".