18525840 has 40 divisors (see below), whose sum is σ = 57430848. Its totient is φ = 4940160.

The previous prime is 18525839. The next prime is 18525841. The reversal of 18525840 is 4852581.

It is an interprime number because it is at equal distance from previous prime (18525839) and next prime (18525841).

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (18525841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38356 + ... + 38835.

Almost surely, 2^18525840 is an apocalyptic number.

18525840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18525840 is an abundant number, since it is smaller than the sum of its proper divisors (38905008).

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

18525840 is a wasteful number, since it uses less digits than its factorization.

18525840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77207 (or 77201 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 18525840 is about 4304.1654243302. The cubic root of 18525840 is about 264.6017037830.

The spelling of 18525840 in words is "eighteen million, five hundred twenty-five thousand, eight hundred forty".