398167279 has 4 divisors (see below), whose sum is σ = 399604984. Its totient is φ = 396729576.

The previous prime is 398167271. The next prime is 398167309. The reversal of 398167279 is 972761893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 972761893 = 139 ⋅6998287.

It is a cyclic number.

It is not a de Polignac number, because 398167279 - 2³ = 398167271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398167271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 718437 + ... + 718990.

It is an arithmetic number, because the mean of its divisors is an integer number (99901246).

Almost surely, 2^398167279 is an apocalyptic number.

398167279 is a deficient number, since it is larger than the sum of its proper divisors (1437705).

398167279 is a wasteful number, since it uses less digits than its factorization.

398167279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437704.

The product of its digits is 1143072, while the sum is 52.

The square root of 398167279 is about 19954.1293721375. The cubic root of 398167279 is about 735.6792763900.

The spelling of 398167279 in words is "three hundred ninety-eight million, one hundred sixty-seven thousand, two hundred seventy-nine".