399221167 has 4 divisors (see below), whose sum is σ = 399327256. Its totient is φ = 399115080.

The previous prime is 399221129. The next prime is 399221177. The reversal of 399221167 is 761122993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 761122993 = 107 ⋅7113299.

It is a cyclic number.

It is not a de Polignac number, because 399221167 - 2¹⁵ = 399188399 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 (399221117) 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, 47184 + ... + 54997.

It is an arithmetic number, because the mean of its divisors is an integer number (99831814).

Almost surely, 2^399221167 is an apocalyptic number.

399221167 is a deficient number, since it is larger than the sum of its proper divisors (106089).

399221167 is a wasteful number, since it uses less digits than its factorization.

399221167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106088.

The product of its digits is 40824, while the sum is 40.

The square root of 399221167 is about 19980.5196879360. The cubic root of 399221167 is about 736.3277814714.

The spelling of 399221167 in words is "three hundred ninety-nine million, two hundred twenty-one thousand, one hundred sixty-seven".