52171890 has 16 divisors (see below), whose sum is σ = 125212608. Its totient is φ = 13912496.

The previous prime is 52171879. The next prime is 52171907. The reversal of 52171890 is 9817125.

It is a super-2 number, since 2×52171890² = 5443812212344200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 869502 + ... + 869561.

It is an arithmetic number, because the mean of its divisors is an integer number (7825788).

Almost surely, 2^52171890 is an apocalyptic number.

52171890 is an abundant number, since it is smaller than the sum of its proper divisors (73040718).

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

52171890 is a wasteful number, since it uses less digits than its factorization.

52171890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1739073.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 52171890 is about 7223.0111449450. The cubic root of 52171890 is about 373.6619334420.

The spelling of 52171890 in words is "fifty-two million, one hundred seventy-one thousand, eight hundred ninety".