402501439 has 2 divisors, whose sum is σ = 402501440. Its totient is φ = 402501438.

The previous prime is 402501433. The next prime is 402501493. The reversal of 402501439 is 934105204.

Together with next prime (402501493) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402501439 - 2²⁷ = 268283711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402501433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201250719 + 201250720.

It is an arithmetic number, because the mean of its divisors is an integer number (201250720).

Almost surely, 2^402501439 is an apocalyptic number.

402501439 is a deficient number, since it is larger than the sum of its proper divisors (1).

402501439 is an equidigital number, since it uses as much as digits as its factorization.

402501439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 402501439 is about 20062.4385108092. The cubic root of 402501439 is about 738.3390058565.

The spelling of 402501439 in words is "four hundred two million, five hundred one thousand, four hundred thirty-nine".