861290 has 16 divisors (see below), whose sum is σ = 1587168. Its totient is φ = 336336.

The previous prime is 861239. The next prime is 861293. The reversal of 861290 is 92168.

It is not an unprimeable number, because it can be changed into a prime (861293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 572 + ... + 1431.

It is an arithmetic number, because the mean of its divisors is an integer number (99198).

2⁸⁶¹²⁹⁰ is an apocalyptic number.

861290 is a deficient number, since it is larger than the sum of its proper divisors (725878).

861290 is a wasteful number, since it uses less digits than its factorization.

861290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2053.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 861290 is about 928.0571103116. The cubic root of 861290 is about 95.1443788032.

The spelling of 861290 in words is "eight hundred sixty-one thousand, two hundred ninety".