398111779 has 20 divisors (see below), whose sum is σ = 441094896. Its totient is φ = 359183136.

The previous prime is 398111773. The next prime is 398111783. The reversal of 398111779 is 977111893.

It is not a de Polignac number, because 398111779 - 2³ = 398111771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398111771) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1513602 + ... + 1513864.

Almost surely, 2^398111779 is an apocalyptic number.

398111779 is a deficient number, since it is larger than the sum of its proper divisors (42983117).

398111779 is an frugal number, since it uses more digits than its factorization.

398111779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368 (or 329 counting only the distinct ones).

The product of its digits is 95256, while the sum is 46.

The square root of 398111779 is about 19952.7386340823. The cubic root of 398111779 is about 735.6450930210.

The spelling of 398111779 in words is "three hundred ninety-eight million, one hundred eleven thousand, seven hundred seventy-nine".