18798740 has 24 divisors (see below), whose sum is σ = 40397280. Its totient is φ = 7344288.

The previous prime is 18798739. The next prime is 18798743. The reversal of 18798740 is 4789781.

It is a junction number, because it is equal to n+sod(n) for n = 18798691 and 18798700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18798743) 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, 10070 + ... + 11789.

It is an arithmetic number, because the mean of its divisors is an integer number (1683220).

Almost surely, 2^18798740 is an apocalyptic number.

18798740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18798740 is an abundant number, since it is smaller than the sum of its proper divisors (21598540).

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

18798740 is a wasteful number, since it uses less digits than its factorization.

18798740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21911 (or 21909 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 18798740 is about 4335.7513766359. The cubic root of 18798740 is about 265.8946385821.

The spelling of 18798740 in words is "eighteen million, seven hundred ninety-eight thousand, seven hundred forty".