400192040 has 16 divisors (see below), whose sum is σ = 900432180. Its totient is φ = 160076800.

The previous prime is 400192007. The next prime is 400192043. The reversal of 400192040 is 40291004.

It can be written as a sum of positive squares in 2 ways, for example, as 394499044 + 5692996 = 19862^2 + 2386^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (400192043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5002361 + ... + 5002440.

Almost surely, 2^400192040 is an apocalyptic number.

400192040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400192040 is an abundant number, since it is smaller than the sum of its proper divisors (500240140).

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

400192040 is a wasteful number, since it uses less digits than its factorization.

400192040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10004812 (or 10004808 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 400192040 is about 20004.8004238983. The cubic root of 400192040 is about 736.9241944312.

The spelling of 400192040 in words is "four hundred million, one hundred ninety-two thousand, forty".