402121187 has 16 divisors (see below), whose sum is σ = 457416960. Its totient is φ = 350440992.

The previous prime is 402121151. The next prime is 402121189. The reversal of 402121187 is 781121204.

It is a cyclic number.

It is not a de Polignac number, because 402121187 - 2¹⁴ = 402104803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (402121189) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73178 + ... + 78480.

It is an arithmetic number, because the mean of its divisors is an integer number (28588560).

Almost surely, 2^402121187 is an apocalyptic number.

402121187 is a deficient number, since it is larger than the sum of its proper divisors (55295773).

402121187 is a wasteful number, since it uses less digits than its factorization.

402121187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5642.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 402121187 is about 20052.9595571327. The cubic root of 402121187 is about 738.1064242103.

The spelling of 402121187 in words is "four hundred two million, one hundred twenty-one thousand, one hundred eighty-seven".