402121188 has 36 divisors (see below), whose sum is σ = 1161684160. Its totient is φ = 114891696.

The previous prime is 402121151. The next prime is 402121189. The reversal of 402121188 is 881121204.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (402121189) 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 11 ways as a sum of consecutive naturals, for example, 797608 + ... + 798111.

Almost surely, 2^402121188 is an apocalyptic number.

It is an amenable number.

402121188 is an abundant number, since it is smaller than the sum of its proper divisors (759562972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

402121188 is a wasteful number, since it uses less digits than its factorization.

402121188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1595736 (or 1595731 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 402121188 is about 20052.9595820667. The cubic root of 402121188 is about 738.1064248221.

The spelling of 402121188 in words is "four hundred two million, one hundred twenty-one thousand, one hundred eighty-eight".