398978394 has 32 divisors (see below), whose sum is σ = 826454016. Its totient is φ = 128323440.

The previous prime is 398978383. The next prime is 398978399. The reversal of 398978394 is 493879893.

It is not an unprimeable number, because it can be changed into a prime (398978399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10059 + ... + 29985.

It is an arithmetic number, because the mean of its divisors is an integer number (25826688).

Almost surely, 2^398978394 is an apocalyptic number.

398978394 is an abundant number, since it is smaller than the sum of its proper divisors (427475622).

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

398978394 is a wasteful number, since it uses less digits than its factorization.

398978394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20050.

The product of its digits is 11757312, while the sum is 60.

The square root of 398978394 is about 19974.4435216604. The cubic root of 398978394 is about 736.1784935016.

The spelling of 398978394 in words is "three hundred ninety-eight million, nine hundred seventy-eight thousand, three hundred ninety-four".