861634 has 12 divisors (see below), whose sum is σ = 1328886. Its totient is φ = 418992.

The previous prime is 861617. The next prime is 861647. The reversal of 861634 is 436168.

It can be written as a sum of positive squares in only one way, i.e., 815409 + 46225 = 903^2 + 215^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3582 + ... + 3814.

2⁸⁶¹⁶³⁴ is an apocalyptic number.

861634 is a deficient number, since it is larger than the sum of its proper divisors (467252).

861634 is a wasteful number, since it uses less digits than its factorization.

861634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321 (or 278 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 861634 is about 928.2424252317. The cubic root of 861634 is about 95.1570440340.

The spelling of 861634 in words is "eight hundred sixty-one thousand, six hundred thirty-four".