399236331 has 8 divisors (see below), whose sum is σ = 573262480. Its totient is φ = 245683872.

The previous prime is 399236329. The next prime is 399236351. The reversal of 399236331 is 133632993.

It is a happy number.

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

It is not a de Polignac number, because 399236331 - 2¹ = 399236329 is a prime.

It is a super-2 number, since 2×399236331² = 318779295980683122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 10236829 = 399236331 / (3 + 9 + 9 + 2 + 3 + 6 + 3 + 3 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 399236331.

It is not an unprimeable number, because it can be changed into a prime (399236351) 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, 5118376 + ... + 5118453.

It is an arithmetic number, because the mean of its divisors is an integer number (71657810).

Almost surely, 2^399236331 is an apocalyptic number.

399236331 is a deficient number, since it is larger than the sum of its proper divisors (174026149).

399236331 is a wasteful number, since it uses less digits than its factorization.

399236331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10236845.

The product of its digits is 78732, while the sum is 39.

The square root of 399236331 is about 19980.8991539420. The cubic root of 399236331 is about 736.3371042345.

The spelling of 399236331 in words is "three hundred ninety-nine million, two hundred thirty-six thousand, three hundred thirty-one".