400140036 has 36 divisors (see below), whose sum is σ = 1030554252. Its totient is φ = 130862784.

The previous prime is 400140023. The next prime is 400140047. The reversal of 400140036 is 630041004.

It can be written as a sum of positive squares in 2 ways, for example, as 216266436 + 183873600 = 14706^2 + 13560^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×400140036² = 320224096820162592, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102951 + ... + 106766.

It is an arithmetic number, because the mean of its divisors is an integer number (28626507).

Almost surely, 2^400140036 is an apocalyptic number.

It is an amenable number.

400140036 is an abundant number, since it is smaller than the sum of its proper divisors (630414216).

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

400140036 is a wasteful number, since it uses less digits than its factorization.

400140036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209780 (or 209775 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 400140036 is about 20003.5005936461. The cubic root of 400140036 is about 736.8922725353.

The spelling of 400140036 in words is "four hundred million, one hundred forty thousand, thirty-six".