402040381987 has 2 divisors, whose sum is σ = 402040381988. Its totient is φ = 402040381986.

The previous prime is 402040381969. The next prime is 402040382089. The reversal of 402040381987 is 789183040204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402040381987 - 2³⁵ = 367680643619 is a prime.

It is not a weakly prime, because it can be changed into another prime (402040382987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201020190993 + 201020190994.

It is an arithmetic number, because the mean of its divisors is an integer number (201020190994).

Almost surely, 2^402040381987 is an apocalyptic number.

402040381987 is a deficient number, since it is larger than the sum of its proper divisors (1).

402040381987 is an equidigital number, since it uses as much as digits as its factorization.

402040381987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 402040381987 in words is "four hundred two billion, forty million, three hundred eighty-one thousand, nine hundred eighty-seven".