870621 has 16 divisors (see below), whose sum is σ = 1260864. Its totient is φ = 532224.

The previous prime is 870613. The next prime is 870629. The reversal of 870621 is 126078.

It is an interprime number because it is at equal distance from previous prime (870613) and next prime (870629).

It is not a de Polignac number, because 870621 - 2³ = 870613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 870591 and 870600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1995 + ... + 2391.

It is an arithmetic number, because the mean of its divisors is an integer number (78804).

2⁸⁷⁰⁶²¹ is an apocalyptic number.

It is an amenable number.

870621 is a deficient number, since it is larger than the sum of its proper divisors (390243).

870621 is a wasteful number, since it uses less digits than its factorization.

870621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 870621 is about 933.0707368683. The cubic root of 870621 is about 95.4867355461.

Adding to 870621 its reverse (126078), we get a palindrome (996699).

The spelling of 870621 in words is "eight hundred seventy thousand, six hundred twenty-one".