998400387 has 16 divisors (see below), whose sum is σ = 1348414848. Its totient is φ = 657047040.

The previous prime is 998400331. The next prime is 998400397. The reversal of 998400387 is 783004899.

It is not a de Polignac number, because 998400387 - 2²⁶ = 931291523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (998400317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69268 + ... + 82430.

It is an arithmetic number, because the mean of its divisors is an integer number (84275928).

Almost surely, 2^998400387 is an apocalyptic number.

998400387 is a deficient number, since it is larger than the sum of its proper divisors (350014461).

998400387 is a wasteful number, since it uses less digits than its factorization.

998400387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13490.

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 998400387 is about 31597.4743769182. The cubic root of 998400387 is about 999.4665111069.

The spelling of 998400387 in words is "nine hundred ninety-eight million, four hundred thousand, three hundred eighty-seven".