18077725 has 6 divisors (see below), whose sum is σ = 22416410. Its totient is φ = 14462160.

The previous prime is 18077713. The next prime is 18077729. The reversal of 18077725 is 52777081.

It can be written as a sum of positive squares in 3 ways, for example, as 6724 + 18071001 = 82^2 + 4251^2 .

It is not a de Polignac number, because 18077725 - 2⁵ = 18077693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18077729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 361530 + ... + 361579.

Almost surely, 2^18077725 is an apocalyptic number.

It is an amenable number.

18077725 is a deficient number, since it is larger than the sum of its proper divisors (4338685).

18077725 is an equidigital number, since it uses as much as digits as its factorization.

18077725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723119 (or 723114 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 18077725 is about 4251.7907991810. The cubic root of 18077725 is about 262.4508146697.

The spelling of 18077725 in words is "eighteen million, seventy-seven thousand, seven hundred twenty-five".