398981394 has 24 divisors (see below), whose sum is σ = 987954240. Its totient is φ = 113994648.

The previous prime is 398981389. The next prime is 398981491. The reversal of 398981394 is 493189893.

It is a self number, because there is not a number n which added to its sum of digits gives 398981394.

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 11 ways as a sum of consecutive naturals, for example, 1583134 + ... + 1583385.

It is an arithmetic number, because the mean of its divisors is an integer number (41164760).

Almost surely, 2^398981394 is an apocalyptic number.

398981394 is an abundant number, since it is smaller than the sum of its proper divisors (588972846).

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

398981394 is a wasteful number, since it uses less digits than its factorization.

398981394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3166534 (or 3166531 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 398981394 is about 19974.5186174786. The cubic root of 398981394 is about 736.1803386558.

The spelling of 398981394 in words is "three hundred ninety-eight million, nine hundred eighty-one thousand, three hundred ninety-four".