402040439 has 2 divisors, whose sum is σ = 402040440. Its totient is φ = 402040438.

The previous prime is 402040421. The next prime is 402040477. The reversal of 402040439 is 934040204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402040439 - 2²⁰ = 400991863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402040339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201020219 + 201020220.

It is an arithmetic number, because the mean of its divisors is an integer number (201020220).

Almost surely, 2^402040439 is an apocalyptic number.

402040439 is a deficient number, since it is larger than the sum of its proper divisors (1).

402040439 is an equidigital number, since it uses as much as digits as its factorization.

402040439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 402040439 is about 20050.9460874045. The cubic root of 402040439 is about 738.0570157158.

The spelling of 402040439 in words is "four hundred two million, forty thousand, four hundred thirty-nine".