998401690 has 32 divisors (see below), whose sum is σ = 2111308416. Its totient is φ = 335127360.

The previous prime is 998401667. The next prime is 998401693. The reversal of 998401690 is 96104899.

998401690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×998401690² = 1993611869189712200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 998401690.

It is not an unprimeable number, because it can be changed into a prime (998401693) 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, 347662 + ... + 350521.

It is an arithmetic number, because the mean of its divisors is an integer number (65978388).

Almost surely, 2^998401690 is an apocalyptic number.

998401690 is an abundant number, since it is smaller than the sum of its proper divisors (1112906726).

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

998401690 is a wasteful number, since it uses less digits than its factorization.

998401690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698214.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 998401690 is about 31597.4949956480. The cubic root of 998401690 is about 999.4669459038.

The spelling of 998401690 in words is "nine hundred ninety-eight million, four hundred one thousand, six hundred ninety".