398992442 has 8 divisors (see below), whose sum is σ = 612407136. Its totient is φ = 194856732.

The previous prime is 398992441. The next prime is 398992459. The reversal of 398992442 is 244299893.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (398992441) 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 3 ways as a sum of consecutive naturals, for example, 2319638 + ... + 2319809.

It is an arithmetic number, because the mean of its divisors is an integer number (76550892).

Almost surely, 2^398992442 is an apocalyptic number.

398992442 is a deficient number, since it is larger than the sum of its proper divisors (213414694).

398992442 is a wasteful number, since it uses less digits than its factorization.

398992442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4639492.

The product of its digits is 1119744, while the sum is 50.

The square root of 398992442 is about 19974.7951679110. The cubic root of 398992442 is about 736.1871336638.

The spelling of 398992442 in words is "three hundred ninety-eight million, nine hundred ninety-two thousand, four hundred forty-two".