166431540 has 48 divisors (see below), whose sum is σ = 508374720. Its totient is φ = 40346880.

The previous prime is 166431527. The next prime is 166431553. The reversal of 166431540 is 45134661.

It is an interprime number because it is at equal distance from previous prime (166431527) and next prime (166431553).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 166431498 and 166431507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125425 + ... + 126744.

It is an arithmetic number, because the mean of its divisors is an integer number (10591140).

Almost surely, 2^166431540 is an apocalyptic number.

166431540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166431540 is an abundant number, since it is smaller than the sum of its proper divisors (341943180).

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

166431540 is a wasteful number, since it uses less digits than its factorization.

166431540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252192 (or 252190 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 166431540 is about 12900.8348567060. The cubic root of 166431540 is about 550.0622959741.

The spelling of 166431540 in words is "one hundred sixty-six million, four hundred thirty-one thousand, five hundred forty".