172684427 has 4 divisors (see below), whose sum is σ = 173028240. Its totient is φ = 172340616.

The previous prime is 172684417. The next prime is 172684429. The reversal of 172684427 is 724486271.

It is a happy number.

172684427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 724486271 = 5881 ⋅123191.

It is a cyclic number.

It is not a de Polignac number, because 172684427 - 2⁶ = 172684363 is a prime.

It is a super-2 number, since 2×172684427² = 59639822656636658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172684429) 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, 171152 + ... + 172157.

It is an arithmetic number, because the mean of its divisors is an integer number (43257060).

Almost surely, 2^172684427 is an apocalyptic number.

172684427 is a deficient number, since it is larger than the sum of its proper divisors (343813).

172684427 is an equidigital number, since it uses as much as digits as its factorization.

172684427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343812.

The product of its digits is 150528, while the sum is 41.

The square root of 172684427 is about 13140.9446768488. The cubic root of 172684427 is about 556.8664558701.

The spelling of 172684427 in words is "one hundred seventy-two million, six hundred eighty-four thousand, four hundred twenty-seven".