18725436 has 18 divisors (see below), whose sum is σ = 47333832. Its totient is φ = 6241800.

The previous prime is 18725429. The next prime is 18725453. The reversal of 18725436 is 63452781.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 520151 = 18725436 / (1 + 8 + 7 + 2 + 5 + 4 + 3 + 6).

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 18725436.

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, 260040 + ... + 260111.

Almost surely, 2^18725436 is an apocalyptic number.

It is an amenable number.

18725436 is an abundant number, since it is smaller than the sum of its proper divisors (28608396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18725436 is a wasteful number, since it uses less digits than its factorization.

18725436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520161 (or 520156 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 18725436 is about 4327.2896829309. The cubic root of 18725436 is about 265.5485776180.

The spelling of 18725436 in words is "eighteen million, seven hundred twenty-five thousand, four hundred thirty-six".