402145439 has 2 divisors, whose sum is σ = 402145440. Its totient is φ = 402145438.

The previous prime is 402145379. The next prime is 402145441. The reversal of 402145439 is 934541204.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402145439 is a prime.

Together with 402145441, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402145039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201072719 + 201072720.

It is an arithmetic number, because the mean of its divisors is an integer number (201072720).

Almost surely, 2^402145439 is an apocalyptic number.

402145439 is a deficient number, since it is larger than the sum of its proper divisors (1).

402145439 is an equidigital number, since it uses as much as digits as its factorization.

402145439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 402145439 is about 20053.5642467867. The cubic root of 402145439 is about 738.1212623551.

The spelling of 402145439 in words is "four hundred two million, one hundred forty-five thousand, four hundred thirty-nine".