400389978652 has 48 divisors (see below), whose sum is σ = 742202818560. Its totient is φ = 188684199872.

The previous prime is 400389978641. The next prime is 400389978661. The reversal of 400389978652 is 256879983004.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1992243 + ... + 2183989.

It is an arithmetic number, because the mean of its divisors is an integer number (15462558720).

Almost surely, 2^400389978652 is an apocalyptic number.

It is an amenable number.

400389978652 is a deficient number, since it is larger than the sum of its proper divisors (341812839908).

400389978652 is a wasteful number, since it uses less digits than its factorization.

400389978652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192210 (or 192208 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 61.

The spelling of 400389978652 in words is "four hundred billion, three hundred eighty-nine million, nine hundred seventy-eight thousand, six hundred fifty-two".