400196128 has 24 divisors (see below), whose sum is σ = 792614592. Its totient is φ = 198897216.

The previous prime is 400196123. The next prime is 400196129. The reversal of 400196128 is 821691004.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 400196128.

It is not an unprimeable number, because it can be changed into a prime (400196123) 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, 32100 + ... + 42787.

It is an arithmetic number, because the mean of its divisors is an integer number (33025608).

Almost surely, 2^400196128 is an apocalyptic number.

It is an amenable number.

400196128 is a deficient number, since it is larger than the sum of its proper divisors (392418464).

400196128 is a wasteful number, since it uses less digits than its factorization.

400196128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75064 (or 75056 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 400196128 is about 20004.9025991130. The cubic root of 400196128 is about 736.9267036730.

The spelling of 400196128 in words is "four hundred million, one hundred ninety-six thousand, one hundred twenty-eight".