331808399 has 4 divisors (see below), whose sum is σ = 357332136. Its totient is φ = 306284664.

The previous prime is 331808377. The next prime is 331808413. The reversal of 331808399 is 993808133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993808133 = 3083 ⋅322351.

It is a cyclic number.

It is not a de Polignac number, because 331808399 - 2²⁰ = 330759823 is a prime.

It is a super-2 number, since 2×331808399² = 220193627293886402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331808369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12761849 + ... + 12761874.

It is an arithmetic number, because the mean of its divisors is an integer number (89333034).

Almost surely, 2^331808399 is an apocalyptic number.

331808399 is a deficient number, since it is larger than the sum of its proper divisors (25523737).

331808399 is a wasteful number, since it uses less digits than its factorization.

331808399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25523736.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 331808399 is about 18215.6086640002. The cubic root of 331808399 is about 692.3023274681.

The spelling of 331808399 in words is "three hundred thirty-one million, eight hundred eight thousand, three hundred ninety-nine".