725866 has 16 divisors (see below), whose sum is σ = 1186056. Its totient is φ = 331776.

The previous prime is 725863. The next prime is 725867. The reversal of 725866 is 668527.

725866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 648025 + 77841 = 805^2 + 279^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (725861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 970 + ... + 1546.

2⁷²⁵⁸⁶⁶ is an apocalyptic number.

725866 is a deficient number, since it is larger than the sum of its proper divisors (460190).

725866 is a wasteful number, since it uses less digits than its factorization.

725866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633.

The product of its digits is 20160, while the sum is 34.

The square root of 725866 is about 851.9776992387. The cubic root of 725866 is about 89.8708435465.

The spelling of 725866 in words is "seven hundred twenty-five thousand, eight hundred sixty-six".