18070825 has 6 divisors (see below), whose sum is σ = 22407854. Its totient is φ = 14456640.

The previous prime is 18070817. The next prime is 18070831. The reversal of 18070825 is 52807081.

It can be written as a sum of positive squares in 3 ways, for example, as 2930944 + 15139881 = 1712^2 + 3891^2 .

It is not a de Polignac number, because 18070825 - 2³ = 18070817 is a prime.

It is a super-3 number, since 3×18070825³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 361392 + ... + 361441.

Almost surely, 2^18070825 is an apocalyptic number.

It is an amenable number.

18070825 is a deficient number, since it is larger than the sum of its proper divisors (4337029).

18070825 is an equidigital number, since it uses as much as digits as its factorization.

18070825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722843 (or 722838 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 18070825 is about 4250.9792989381. The cubic root of 18070825 is about 262.4174192237.

The spelling of 18070825 in words is "eighteen million, seventy thousand, eight hundred twenty-five".