18385425 has 36 divisors (see below), whose sum is σ = 33750444. Its totient is φ = 9561600.

The previous prime is 18385421. The next prime is 18385429. The reversal of 18385425 is 52458381.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18385421) and next prime (18385429).

It can be written as a sum of positive squares in 6 ways, for example, as 1640961 + 16744464 = 1281^2 + 4092^2 .

It is not a de Polignac number, because 18385425 - 2² = 18385421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18385425.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18385421) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8229 + ... + 10221.

Almost surely, 2^18385425 is an apocalyptic number.

18385425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18385425 is a deficient number, since it is larger than the sum of its proper divisors (15365019).

18385425 is a wasteful number, since it uses less digits than its factorization.

18385425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2050 (or 2042 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 18385425 is about 4287.8228741402. The cubic root of 18385425 is about 263.9314991007.

The spelling of 18385425 in words is "eighteen million, three hundred eighty-five thousand, four hundred twenty-five".