400399998 has 8 divisors (see below), whose sum is σ = 800800008. Its totient is φ = 133466664.

The previous prime is 400399949. The next prime is 400400041. The reversal of 400399998 is 899993004.

It is a sphenic number, since it is the product of 3 distinct primes.

400399998 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 400399998.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33366661 + ... + 33366672.

It is an arithmetic number, because the mean of its divisors is an integer number (100100001).

Almost surely, 2^400399998 is an apocalyptic number.

400399998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

400399998 is a wasteful number, since it uses less digits than its factorization.

400399998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66733338.

The product of its (nonzero) digits is 629856, while the sum is 51.

The square root of 400399998 is about 20009.9974512742. The cubic root of 400399998 is about 737.0518187789.

The spelling of 400399998 in words is "four hundred million, three hundred ninety-nine thousand, nine hundred ninety-eight".