840442 has 4 divisors (see below), whose sum is σ = 1260666. Its totient is φ = 420220.

The previous prime is 840439. The next prime is 840451. The reversal of 840442 is 244048.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 826281 + 14161 = 909^2 + 119^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210109 + ... + 210112.

2⁸⁴⁰⁴⁴² is an apocalyptic number.

840442 is a deficient number, since it is larger than the sum of its proper divisors (420224).

840442 is a wasteful number, since it uses less digits than its factorization.

840442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420223.

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 840442 is about 916.7562380480. The cubic root of 840442 is about 94.3704260754.

The spelling of 840442 in words is "eight hundred forty thousand, four hundred forty-two".