402440331 has 4 divisors (see below), whose sum is σ = 536587112. Its totient is φ = 268293552.

The previous prime is 402440323. The next prime is 402440333. The reversal of 402440331 is 133044204.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 402440331 - 2³ = 402440323 is a prime.

It is a super-2 number, since 2×402440331² = 323916440030779122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 402440298 and 402440307.

It is not an unprimeable number, because it can be changed into a prime (402440333) 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, 67073386 + ... + 67073391.

It is an arithmetic number, because the mean of its divisors is an integer number (134146778).

Almost surely, 2^402440331 is an apocalyptic number.

402440331 is a deficient number, since it is larger than the sum of its proper divisors (134146781).

402440331 is a wasteful number, since it uses less digits than its factorization.

402440331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134146780.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 402440331 is about 20060.9155075236. The cubic root of 402440331 is about 738.3016389479.

Adding to 402440331 its reverse (133044204), we get a palindrome (535484535).

The spelling of 402440331 in words is "four hundred two million, four hundred forty thousand, three hundred thirty-one".