870442 has 4 divisors (see below), whose sum is σ = 1305666. Its totient is φ = 435220.

The previous prime is 870437. The next prime is 870461. The reversal of 870442 is 244078.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244078 = 2 ⋅122039.

It can be written as a sum of positive squares in only one way, i.e., 848241 + 22201 = 921^2 + 149^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 217609 + ... + 217612.

2⁸⁷⁰⁴⁴² is an apocalyptic number.

870442 is a deficient number, since it is larger than the sum of its proper divisors (435224).

870442 is a wasteful number, since it uses less digits than its factorization.

870442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435223.

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 870442 is about 932.9748120930. The cubic root of 870442 is about 95.4801910615.

The spelling of 870442 in words is "eight hundred seventy thousand, four hundred forty-two".