18698040 has 160 divisors (see below), whose sum is σ = 65340000. Its totient is φ = 4790016.

The previous prime is 18698039. The next prime is 18698041. The reversal of 18698040 is 4089681.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18698039) and next prime (18698041).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18697986 and 18698004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18698041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 93861 + ... + 94059.

It is an arithmetic number, because the mean of its divisors is an integer number (408375).

Almost surely, 2^18698040 is an apocalyptic number.

18698040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18698040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32670000).

18698040 is an abundant number, since it is smaller than the sum of its proper divisors (46641960).

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

18698040 is a wasteful number, since it uses less digits than its factorization.

18698040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 18698040 is about 4324.1230324772. The cubic root of 18698040 is about 265.4190119732.

The spelling of 18698040 in words is "eighteen million, six hundred ninety-eight thousand, forty".