172421286 has 24 divisors (see below), whose sum is σ = 352362840. Its totient is φ = 56246592.

The previous prime is 172421251. The next prime is 172421329. The reversal of 172421286 is 682124271.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 6750 + ... + 19758.

It is an arithmetic number, because the mean of its divisors is an integer number (14681785).

Almost surely, 2^172421286 is an apocalyptic number.

172421286 is an abundant number, since it is smaller than the sum of its proper divisors (179941554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172421286 is a wasteful number, since it uses less digits than its factorization.

172421286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13108 (or 13061 counting only the distinct ones).

The product of its digits is 10752, while the sum is 33.

The square root of 172421286 is about 13130.9286038726. The cubic root of 172421286 is about 556.5834562338.

It can be divided in two parts, 17242 and 1286, that added together give a triangular number (18528 = T₁₉₂).

The spelling of 172421286 in words is "one hundred seventy-two million, four hundred twenty-one thousand, two hundred eighty-six".