402404531 has 2 divisors, whose sum is σ = 402404532. Its totient is φ = 402404530.

The previous prime is 402404507. The next prime is 402404537. The reversal of 402404531 is 135404204.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402404531 is a prime.

It is a super-2 number, since 2×402404531² = 323858813138659922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 402404497 and 402404506.

It is not a weakly prime, because it can be changed into another prime (402404537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201202265 + 201202266.

It is an arithmetic number, because the mean of its divisors is an integer number (201202266).

Almost surely, 2^402404531 is an apocalyptic number.

402404531 is a deficient number, since it is larger than the sum of its proper divisors (1).

402404531 is an equidigital number, since it uses as much as digits as its factorization.

402404531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 402404531 is about 20060.0232053704. The cubic root of 402404531 is about 738.2797458618.

Adding to 402404531 its reverse (135404204), we get a palindrome (537808735).

The spelling of 402404531 in words is "four hundred two million, four hundred four thousand, five hundred thirty-one".