400342404 has 48 divisors (see below), whose sum is σ = 1164635136. Its totient is φ = 103984800.

The previous prime is 400342399. The next prime is 400342433. The reversal of 400342404 is 404243004.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215712 + ... + 217559.

It is an arithmetic number, because the mean of its divisors is an integer number (24263232).

Almost surely, 2^400342404 is an apocalyptic number.

400342404 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

400342404 is an abundant number, since it is smaller than the sum of its proper divisors (764292732).

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

400342404 is a wasteful number, since it uses less digits than its factorization.

400342404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433296 (or 433294 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 400342404 is about 20008.5582689008. The cubic root of 400342404 is about 737.0164776216.

Adding to 400342404 its reverse (404243004), we get a palindrome (804585408).

The spelling of 400342404 in words is "four hundred million, three hundred forty-two thousand, four hundred four".