18708397 has 8 divisors (see below), whose sum is σ = 19552896. Its totient is φ = 17882592.

The previous prime is 18708379. The next prime is 18708409. The reversal of 18708397 is 79380781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18708397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18708337) 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, 2608 + ... + 6649.

It is an arithmetic number, because the mean of its divisors is an integer number (2444112).

Almost surely, 2^18708397 is an apocalyptic number.

It is an amenable number.

18708397 is a deficient number, since it is larger than the sum of its proper divisors (844499).

18708397 is an equidigital number, since it uses as much as digits as its factorization.

18708397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9347.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 18708397 is about 4325.3204505562. The cubic root of 18708397 is about 265.4680088611.

The spelling of 18708397 in words is "eighteen million, seven hundred eight thousand, three hundred ninety-seven".