402047431 has 2 divisors, whose sum is σ = 402047432. Its totient is φ = 402047430.

The previous prime is 402047423. The next prime is 402047441. The reversal of 402047431 is 134740204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402047431 - 2³ = 402047423 is a prime.

It is a super-2 number, since 2×402047431² = 323284273547399522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 402047396 and 402047405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402047411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201023715 + 201023716.

It is an arithmetic number, because the mean of its divisors is an integer number (201023716).

Almost surely, 2^402047431 is an apocalyptic number.

402047431 is a deficient number, since it is larger than the sum of its proper divisors (1).

402047431 is an equidigital number, since it uses as much as digits as its factorization.

402047431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 402047431 is about 20051.1204425089. The cubic root of 402047431 is about 738.0612942777.

Adding to 402047431 its reverse (134740204), we get a palindrome (536787635).

The spelling of 402047431 in words is "four hundred two million, forty-seven thousand, four hundred thirty-one".