402389020 has 24 divisors (see below), whose sum is σ = 921837168. Its totient is φ = 146323200.

The previous prime is 402389017. The next prime is 402389033. The reversal of 402389020 is 20983204.

It is a self number, because there is not a number n which added to its sum of digits gives 402389020.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 914301 + ... + 914740.

It is an arithmetic number, because the mean of its divisors is an integer number (38409882).

Almost surely, 2^402389020 is an apocalyptic number.

It is an amenable number.

402389020 is an abundant number, since it is smaller than the sum of its proper divisors (519448148).

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

402389020 is a wasteful number, since it uses less digits than its factorization.

402389020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829061 (or 1829059 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 402389020 is about 20059.6365869375. The cubic root of 402389020 is about 738.2702598816.

The spelling of 402389020 in words is "four hundred two million, three hundred eighty-nine thousand, twenty".