18261725 has 6 divisors (see below), whose sum is σ = 22644570. Its totient is φ = 14609360.

The previous prime is 18261673. The next prime is 18261731. The reversal of 18261725 is 52716281.

It can be written as a sum of positive squares in 3 ways, for example, as 1006009 + 17255716 = 1003^2 + 4154^2 .

It is not a de Polignac number, because 18261725 - 2¹⁴ = 18245341 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18261691 and 18261700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 365210 + ... + 365259.

It is an arithmetic number, because the mean of its divisors is an integer number (3774095).

Almost surely, 2^18261725 is an apocalyptic number.

It is an amenable number.

18261725 is a deficient number, since it is larger than the sum of its proper divisors (4382845).

18261725 is an equidigital number, since it uses as much as digits as its factorization.

18261725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730479 (or 730474 counting only the distinct ones).

The product of its digits is 6720, while the sum is 32.

The square root of 18261725 is about 4273.3739597653. The cubic root of 18261725 is about 263.3382425334.

The spelling of 18261725 in words is "eighteen million, two hundred sixty-one thousand, seven hundred twenty-five".