172858420 has 24 divisors (see below), whose sum is σ = 414860544. Its totient is φ = 59265696.

The previous prime is 172858417. The next prime is 172858463. The reversal of 172858420 is 24858271.

It is a self number, because there is not a number n which added to its sum of digits gives 172858420.

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 7 ways as a sum of consecutive naturals, for example, 617212 + ... + 617491.

It is an arithmetic number, because the mean of its divisors is an integer number (17285856).

Almost surely, 2^172858420 is an apocalyptic number.

172858420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172858420 is an abundant number, since it is smaller than the sum of its proper divisors (242002124).

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

172858420 is a wasteful number, since it uses less digits than its factorization.

172858420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234719 (or 1234717 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 172858420 is about 13147.5632723330. The cubic root of 172858420 is about 557.0534218547.

The spelling of 172858420 in words is "one hundred seventy-two million, eight hundred fifty-eight thousand, four hundred twenty".