402054187 has 4 divisors (see below), whose sum is σ = 405220096. Its totient is φ = 398888280.

The previous prime is 402054181. The next prime is 402054209. The reversal of 402054187 is 781450204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 402054187 - 2³ = 402054179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402054181) 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 in 3 ways as a sum of consecutive naturals, for example, 1582764 + ... + 1583017.

It is an arithmetic number, because the mean of its divisors is an integer number (101305024).

Almost surely, 2^402054187 is an apocalyptic number.

402054187 is a deficient number, since it is larger than the sum of its proper divisors (3165909).

402054187 is a wasteful number, since it uses less digits than its factorization.

402054187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3165908.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 402054187 is about 20051.2889111897. The cubic root of 402054187 is about 738.0654283788.

The spelling of 402054187 in words is "four hundred two million, fifty-four thousand, one hundred eighty-seven".