402323231 has 4 divisors (see below), whose sum is σ = 403992864. Its totient is φ = 400653600.

The previous prime is 402323227. The next prime is 402323267. The reversal of 402323231 is 132323204.

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

It is a cyclic number.

It is not a de Polignac number, because 402323231 - 2² = 402323227 is a prime.

It is a super-2 number, since 2×402323231² = 323727964404558722, 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 (402322231) 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, 834455 + ... + 834936.

It is an arithmetic number, because the mean of its divisors is an integer number (100998216).

Almost surely, 2^402323231 is an apocalyptic number.

402323231 is a deficient number, since it is larger than the sum of its proper divisors (1669633).

402323231 is a wasteful number, since it uses less digits than its factorization.

402323231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1669632.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 402323231 is about 20057.9966846143. The cubic root of 402323231 is about 738.2300229409.

Adding to 402323231 its reverse (132323204), we get a palindrome (534646435).

The spelling of 402323231 in words is "four hundred two million, three hundred twenty-three thousand, two hundred thirty-one".