861572 has 6 divisors (see below), whose sum is σ = 1507758. Its totient is φ = 430784.

The previous prime is 861571. The next prime is 861589. The reversal of 861572 is 275168.

It can be written as a sum of positive squares in only one way, i.e., 857476 + 4096 = 926^2 + 64^2 .

It is a super-2 number, since 2×861572² = 1484612622368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (861571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107693 + ... + 107700.

It is an arithmetic number, because the mean of its divisors is an integer number (251293).

2⁸⁶¹⁵⁷² is an apocalyptic number.

It is an amenable number.

861572 is a deficient number, since it is larger than the sum of its proper divisors (646186).

861572 is a wasteful number, since it uses less digits than its factorization.

861572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215397 (or 215395 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 861572 is about 928.2090281828. The cubic root of 861572 is about 95.1547615961.

The spelling of 861572 in words is "eight hundred sixty-one thousand, five hundred seventy-two".