402145688 has 16 divisors (see below), whose sum is σ = 861740880. Its totient is φ = 172348128.

The previous prime is 402145687. The next prime is 402145717. The reversal of 402145688 is 886541204.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402145687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3590531 + ... + 3590642.

It is an arithmetic number, because the mean of its divisors is an integer number (53858805).

Almost surely, 2^402145688 is an apocalyptic number.

It is an amenable number.

402145688 is an abundant number, since it is smaller than the sum of its proper divisors (459595192).

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

402145688 is a wasteful number, since it uses less digits than its factorization.

402145688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7181186 (or 7181182 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 38.

The square root of 402145688 is about 20053.5704551584. The cubic root of 402145688 is about 738.1214146981.

The spelling of 402145688 in words is "four hundred two million, one hundred forty-five thousand, six hundred eighty-eight".