18158025 has 24 divisors (see below), whose sum is σ = 30176640. Its totient is φ = 9634240.

The previous prime is 18158011. The next prime is 18158029. The reversal of 18158025 is 52085181.

It is not a de Polignac number, because 18158025 - 2⁶ = 18157961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18157983 and 18158001.

It is not an unprimeable number, because it can be changed into a prime (18158029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17419 + ... + 18431.

It is an arithmetic number, because the mean of its divisors is an integer number (1257360).

Almost surely, 2^18158025 is an apocalyptic number.

18158025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18158025 is a deficient number, since it is larger than the sum of its proper divisors (12018615).

18158025 is a wasteful number, since it uses less digits than its factorization.

18158025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265 (or 1260 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 18158025 is about 4261.2234158748. The cubic root of 18158025 is about 262.8388368153.

The spelling of 18158025 in words is "eighteen million, one hundred fifty-eight thousand, twenty-five".