399224 has 16 divisors (see below), whose sum is σ = 855600. Its totient is φ = 171072.

The previous prime is 399221. The next prime is 399227. The reversal of 399224 is 422993.

399224 = T₂₂ + T₂₃ + ... + T₁₃₃.

It is an interprime number because it is at equal distance from previous prime (399221) and next prime (399227).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 399224.

It is not an unprimeable number, because it can be changed into a prime (399221) 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, 3509 + ... + 3620.

It is an arithmetic number, because the mean of its divisors is an integer number (53475).

2³⁹⁹²²⁴ is an apocalyptic number.

It is an amenable number.

399224 is an abundant number, since it is smaller than the sum of its proper divisors (456376).

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

399224 is a wasteful number, since it uses less digits than its factorization.

399224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7142 (or 7138 counting only the distinct ones).

The product of its digits is 3888, while the sum is 29.

The square root of 399224 is about 631.8417523399. The cubic root of 399224 is about 73.6329523206.

The spelling of 399224 in words is "three hundred ninety-nine thousand, two hundred twenty-four".