399574221 has 8 divisors (see below), whose sum is σ = 549951744. Its totient is φ = 257789760.

The previous prime is 399574207. The next prime is 399574223. The reversal of 399574221 is 122475993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 399574221 - 2⁶ = 399574157 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399574223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2148156 + ... + 2148341.

It is an arithmetic number, because the mean of its divisors is an integer number (68743968).

Almost surely, 2^399574221 is an apocalyptic number.

399574221 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

399574221 is a deficient number, since it is larger than the sum of its proper divisors (150377523).

399574221 is a wasteful number, since it uses less digits than its factorization.

399574221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4296531.

The product of its digits is 136080, while the sum is 42.

The square root of 399574221 is about 19989.3526908702. The cubic root of 399574221 is about 736.5447763722.

The spelling of 399574221 in words is "three hundred ninety-nine million, five hundred seventy-four thousand, two hundred twenty-one".