861925 has 12 divisors (see below), whose sum is σ = 1116000. Its totient is φ = 659120.

The previous prime is 861907. The next prime is 861929. The reversal of 861925 is 529168.

861925 = 106² + 107² + ... + 155².

It is not a de Polignac number, because 861925 - 2⁷ = 861797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 175 + ... + 1324.

It is an arithmetic number, because the mean of its divisors is an integer number (93000).

2⁸⁶¹⁹²⁵ is an apocalyptic number.

It is an amenable number.

861925 is a deficient number, since it is larger than the sum of its proper divisors (254075).

861925 is a wasteful number, since it uses less digits than its factorization.

861925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532 (or 1527 counting only the distinct ones).

The product of its digits is 4320, while the sum is 31.

The square root of 861925 is about 928.3991598445. The cubic root of 861925 is about 95.1677553039.

The spelling of 861925 in words is "eight hundred sixty-one thousand, nine hundred twenty-five".