402012331 has 16 divisors (see below), whose sum is σ = 480121344. Its totient is φ = 329117184.

The previous prime is 402012323. The next prime is 402012337. The reversal of 402012331 is 133210204.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 402012331 - 2³ = 402012323 is a prime.

It is a super-2 number, since 2×402012331² = 323227828552107122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402012337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144651 + ... + 147403.

It is an arithmetic number, because the mean of its divisors is an integer number (30007584).

Almost surely, 2^402012331 is an apocalyptic number.

402012331 is a deficient number, since it is larger than the sum of its proper divisors (78109013).

402012331 is a wasteful number, since it uses less digits than its factorization.

402012331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3690.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 402012331 is about 20050.2451605959. The cubic root of 402012331 is about 738.0398152984.

Adding to 402012331 its reverse (133210204), we get a palindrome (535222535).

The spelling of 402012331 in words is "four hundred two million, twelve thousand, three hundred thirty-one".