402312439 has 2 divisors, whose sum is σ = 402312440. Its totient is φ = 402312438.

The previous prime is 402312437. The next prime is 402312461. The reversal of 402312439 is 934213204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402312439 - 2¹ = 402312437 is a prime.

Together with 402312437, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402312437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201156219 + 201156220.

It is an arithmetic number, because the mean of its divisors is an integer number (201156220).

Almost surely, 2^402312439 is an apocalyptic number.

402312439 is a deficient number, since it is larger than the sum of its proper divisors (1).

402312439 is an equidigital number, since it uses as much as digits as its factorization.

402312439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 402312439 is about 20057.7276629233. The cubic root of 402312439 is about 738.2234220712.

The spelling of 402312439 in words is "four hundred two million, three hundred twelve thousand, four hundred thirty-nine".