18525438 has 12 divisors (see below), whose sum is σ = 40138488. Its totient is φ = 6175140.

The previous prime is 18525431. The next prime is 18525443. The reversal of 18525438 is 83452581.

It is a happy number.

It is a super-3 number, since 3×18525438³ (a number of 23 digits) contains 333 as substring.

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 (18525431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 514578 + ... + 514613.

It is an arithmetic number, because the mean of its divisors is an integer number (3344874).

Almost surely, 2^18525438 is an apocalyptic number.

18525438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18525438 is an abundant number, since it is smaller than the sum of its proper divisors (21613050).

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

18525438 is a wasteful number, since it uses less digits than its factorization.

18525438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029199 (or 1029196 counting only the distinct ones).

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

The square root of 18525438 is about 4304.1187251283. The cubic root of 18525438 is about 264.5997898679.

The spelling of 18525438 in words is "eighteen million, five hundred twenty-five thousand, four hundred thirty-eight".