870436 has 18 divisors (see below), whose sum is σ = 1772358. Its totient is φ = 372960.

The previous prime is 870433. The next prime is 870437. The reversal of 870436 is 634078.

It can be written as a sum of positive squares in only one way, i.e., 705600 + 164836 = 840^2 + 406^2 .

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2025 + ... + 2416.

2⁸⁷⁰⁴³⁶ is an apocalyptic number.

It is an amenable number.

870436 is an abundant number, since it is smaller than the sum of its proper divisors (901922).

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

870436 is a wasteful number, since it uses less digits than its factorization.

870436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4459 (or 4450 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 870436 is about 932.9715965666. The cubic root of 870436 is about 95.4799716778.

The spelling of 870436 in words is "eight hundred seventy thousand, four hundred thirty-six".