172423431 has 16 divisors (see below), whose sum is σ = 255748320. Its totient is φ = 114811200.

The previous prime is 172423337. The next prime is 172423451. The reversal of 172423431 is 134324271.

It is a happy number.

172423431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 172423431 - 2¹⁰ = 172422407 is a prime.

It is a super-2 number, since 2×172423431² = 59459679115623522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 172423395 and 172423404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172423451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22381 + ... + 29081.

It is an arithmetic number, because the mean of its divisors is an integer number (15984270).

Almost surely, 2^172423431 is an apocalyptic number.

172423431 is a deficient number, since it is larger than the sum of its proper divisors (83324889).

172423431 is an equidigital number, since it uses as much as digits as its factorization.

172423431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7663 (or 7657 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 172423431 is about 13131.0102810104. The cubic root of 172423431 is about 556.5857642755.

The spelling of 172423431 in words is "one hundred seventy-two million, four hundred twenty-three thousand, four hundred thirty-one".