400400404642 has 16 divisors (see below), whose sum is σ = 693196742592. Its totient is φ = 169901161200.

The previous prime is 400400404637. The next prime is 400400404673. The reversal of 400400404642 is 246404004004.

It is a self number, because there is not a number n which added to its sum of digits gives 400400404642.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141582888 + ... + 141585715.

It is an arithmetic number, because the mean of its divisors is an integer number (43324796412).

Almost surely, 2^400400404642 is an apocalyptic number.

400400404642 is a deficient number, since it is larger than the sum of its proper divisors (292796337950).

400400404642 is a wasteful number, since it uses less digits than its factorization.

400400404642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283168713.

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 400400404642 its reverse (246404004004), we get a palindrome (646804408646).

The spelling of 400400404642 in words is "four hundred billion, four hundred million, four hundred four thousand, six hundred forty-two".