400166540 has 12 divisors (see below), whose sum is σ = 840349776. Its totient is φ = 160066608.

The previous prime is 400166491. The next prime is 400166593. The reversal of 400166540 is 45661004.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10004144 + ... + 10004183.

It is an arithmetic number, because the mean of its divisors is an integer number (70029148).

Almost surely, 2^400166540 is an apocalyptic number.

It is an amenable number.

400166540 is an abundant number, since it is smaller than the sum of its proper divisors (440183236).

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

400166540 is a wasteful number, since it uses less digits than its factorization.

400166540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20008336 (or 20008334 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 400166540 is about 20004.1630667219. The cubic root of 400166540 is about 736.9085419742.

The spelling of 400166540 in words is "four hundred million, one hundred sixty-six thousand, five hundred forty".