402423887 has 2 divisors, whose sum is σ = 402423888. Its totient is φ = 402423886.

The previous prime is 402423869. The next prime is 402423911. The reversal of 402423887 is 788324204.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402423887 - 2¹⁰ = 402422863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 402423887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402423817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201211943 + 201211944.

It is an arithmetic number, because the mean of its divisors is an integer number (201211944).

Almost surely, 2^402423887 is an apocalyptic number.

402423887 is a deficient number, since it is larger than the sum of its proper divisors (1).

402423887 is an equidigital number, since it uses as much as digits as its factorization.

402423887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86016, while the sum is 38.

The square root of 402423887 is about 20060.5056516530. The cubic root of 402423887 is about 738.2915829665.

The spelling of 402423887 in words is "four hundred two million, four hundred twenty-three thousand, eight hundred eighty-seven".