861772 has 6 divisors (see below), whose sum is σ = 1508108. Its totient is φ = 430884.

The previous prime is 861761. The next prime is 861797. The reversal of 861772 is 277168.

It is a happy number.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107718 + ... + 107725.

2⁸⁶¹⁷⁷² is an apocalyptic number.

It is an amenable number.

861772 is a deficient number, since it is larger than the sum of its proper divisors (646336).

861772 is a wasteful number, since it uses less digits than its factorization.

861772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215447 (or 215445 counting only the distinct ones).

The product of its digits is 4704, while the sum is 31.

The square root of 861772 is about 928.3167562853. The cubic root of 861772 is about 95.1621239059.

The spelling of 861772 in words is "eight hundred sixty-one thousand, seven hundred seventy-two".