861953 has 4 divisors (see below), whose sum is σ = 864048. Its totient is φ = 859860.

The previous prime is 861947. The next prime is 861977. The reversal of 861953 is 359168.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 861953 - 2⁴ = 861937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203 + ... + 1328.

It is an arithmetic number, because the mean of its divisors is an integer number (216012).

2⁸⁶¹⁹⁵³ is an apocalyptic number.

It is an amenable number.

861953 is a deficient number, since it is larger than the sum of its proper divisors (2095).

861953 is a wasteful number, since it uses less digits than its factorization.

861953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2094.

The product of its digits is 6480, while the sum is 32.

The square root of 861953 is about 928.4142394427. The cubic root of 861953 is about 95.1687858144.

The spelling of 861953 in words is "eight hundred sixty-one thousand, nine hundred fifty-three".