861722 has 4 divisors (see below), whose sum is σ = 1292586. Its totient is φ = 430860.

The previous prime is 861719. The next prime is 861733. The reversal of 861722 is 227168.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 844561 + 17161 = 919^2 + 131^2 .

It is a junction number, because it is equal to n+sod(n) for n = 861691 and 861700.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215429 + ... + 215432.

2⁸⁶¹⁷²² is an apocalyptic number.

861722 is a deficient number, since it is larger than the sum of its proper divisors (430864).

861722 is a wasteful number, since it uses less digits than its factorization.

861722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430863.

The product of its digits is 1344, while the sum is 26.

The square root of 861722 is about 928.2898254317. The cubic root of 861722 is about 95.1602834353.

The spelling of 861722 in words is "eight hundred sixty-one thousand, seven hundred twenty-two".