398403992 has 16 divisors (see below), whose sum is σ = 853722960. Its totient is φ = 170744544.

The previous prime is 398403983. The next prime is 398404003. The reversal of 398403992 is 299304893.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3557123 + ... + 3557234.

It is an arithmetic number, because the mean of its divisors is an integer number (53357685).

Almost surely, 2^398403992 is an apocalyptic number.

It is an amenable number.

398403992 is an abundant number, since it is smaller than the sum of its proper divisors (455318968).

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

398403992 is a wasteful number, since it uses less digits than its factorization.

398403992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7114370 (or 7114366 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 398403992 is about 19960.0599197497. The cubic root of 398403992 is about 735.8250361909.

Subtracting from 398403992 its reverse (299304893), we obtain a palindrome (99099099).

The spelling of 398403992 in words is "three hundred ninety-eight million, four hundred three thousand, nine hundred ninety-two".