840402 has 32 divisors (see below), whose sum is σ = 1900800. Its totient is φ = 275184.

The previous prime is 840353. The next prime is 840439. The reversal of 840402 is 204048.

It is a happy number.

840402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 840402.

It is an unprimeable number.

840402 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4168 + ... + 4364.

It is an arithmetic number, because the mean of its divisors is an integer number (59400).

2⁸⁴⁰⁴⁰² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 840402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (950400).

840402 is an abundant number, since it is smaller than the sum of its proper divisors (1060398).

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

840402 is a wasteful number, since it uses less digits than its factorization.

840402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 281 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 840402 is about 916.7344217384. The cubic root of 840402 is about 94.3689288962.

The spelling of 840402 in words is "eight hundred forty thousand, four hundred two".