400999998 has 32 divisors (see below), whose sum is σ = 918215424. Its totient is φ = 114365952.

The previous prime is 400999993. The next prime is 400999999. The reversal of 400999998 is 899999004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400999993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15961 + ... + 32507.

It is an arithmetic number, because the mean of its divisors is an integer number (28694232).

Almost surely, 2^400999998 is an apocalyptic number.

400999998 is an abundant number, since it is smaller than the sum of its proper divisors (517215426).

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

400999998 is a wasteful number, since it uses less digits than its factorization.

400999998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17136.

The product of its (nonzero) digits is 1889568, while the sum is 57.

The square root of 400999998 is about 20024.9843445632. The cubic root of 400999998 is about 737.4197927903.

The spelling of 400999998 in words is "four hundred million, nine hundred ninety-nine thousand, nine hundred ninety-eight".