18725478 has 16 divisors (see below), whose sum is σ = 38463600. Its totient is φ = 6073056.

The previous prime is 18725471. The next prime is 18725489. The reversal of 18725478 is 87452781.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18725471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41953 + ... + 42396.

It is an arithmetic number, because the mean of its divisors is an integer number (2403975).

Almost surely, 2^18725478 is an apocalyptic number.

18725478 is an abundant number, since it is smaller than the sum of its proper divisors (19738122).

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

18725478 is a wasteful number, since it uses less digits than its factorization.

18725478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84391.

The product of its digits is 125440, while the sum is 42.

The square root of 18725478 is about 4327.2945358503. The cubic root of 18725478 is about 265.5487761542.

The spelling of 18725478 in words is "eighteen million, seven hundred twenty-five thousand, four hundred seventy-eight".