18890525 has 18 divisors (see below), whose sum is σ = 23963310. Its totient is φ = 14772160.

The previous prime is 18890507. The next prime is 18890537. The reversal of 18890525 is 52509881.

It can be written as a sum of positive squares in 9 ways, for example, as 5480281 + 13410244 = 2341^2 + 3662^2 .

It is not a de Polignac number, because 18890525 - 2²² = 14696221 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 70091 + ... + 70359.

It is an arithmetic number, because the mean of its divisors is an integer number (1331295).

Almost surely, 2^18890525 is an apocalyptic number.

It is an amenable number.

18890525 is a deficient number, since it is larger than the sum of its proper divisors (5072785).

18890525 is an equidigital number, since it uses as much as digits as its factorization.

18890525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385 (or 327 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 38.

The square root of 18890525 is about 4346.3231587170. The cubic root of 18890525 is about 266.3266804346.

The spelling of 18890525 in words is "eighteen million, eight hundred ninety thousand, five hundred twenty-five".