400304040 has 32 divisors (see below), whose sum is σ = 1200912480. Its totient is φ = 106747712.

The previous prime is 400304017. The next prime is 400304053. The reversal of 400304040 is 40403004.

400304040 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1667814 + ... + 1668053.

It is an arithmetic number, because the mean of its divisors is an integer number (37528515).

Almost surely, 2^400304040 is an apocalyptic number.

400304040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400304040 is an abundant number, since it is smaller than the sum of its proper divisors (800608440).

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

400304040 is a wasteful number, since it uses less digits than its factorization.

400304040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3335881 (or 3335877 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 400304040 is about 20007.5995561687. The cubic root of 400304040 is about 736.9929346051.

Adding to 400304040 its reverse (40403004), we get a palindrome (440707044).

The spelling of 400304040 in words is "four hundred million, three hundred four thousand, forty".