402251887 has 2 divisors, whose sum is σ = 402251888. Its totient is φ = 402251886.

The previous prime is 402251879. The next prime is 402251891. The reversal of 402251887 is 788152204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402251887 - 2³ = 402251879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402251587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201125943 + 201125944.

It is an arithmetic number, because the mean of its divisors is an integer number (201125944).

Almost surely, 2^402251887 is an apocalyptic number.

402251887 is a deficient number, since it is larger than the sum of its proper divisors (1).

402251887 is an equidigital number, since it uses as much as digits as its factorization.

402251887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 402251887 is about 20056.2181629539. The cubic root of 402251887 is about 738.1863835715.

The spelling of 402251887 in words is "four hundred two million, two hundred fifty-one thousand, eight hundred eighty-seven".