402839388 has 108 divisors (see below), whose sum is σ = 1236165840. Its totient is φ = 110081664.

The previous prime is 402839383. The next prime is 402839399. The reversal of 402839388 is 883938204.

402839388 is a `hidden beast` number, since 402 + 83 + 93 + 88 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402839383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 35608 + ... + 45536.

It is an arithmetic number, because the mean of its divisors is an integer number (11445980).

Almost surely, 2^402839388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402839388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (618082920).

402839388 is an abundant number, since it is smaller than the sum of its proper divisors (833326452).

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

402839388 is a wasteful number, since it uses less digits than its factorization.

402839388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9976 (or 9964 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 402839388 is about 20070.8591744350. The cubic root of 402839388 is about 738.5455899021.

The spelling of 402839388 in words is "four hundred two million, eight hundred thirty-nine thousand, three hundred eighty-eight".