18709397 has 8 divisors (see below), whose sum is σ = 21408576. Its totient is φ = 16016832.

The previous prime is 18709393. The next prime is 18709417. The reversal of 18709397 is 79390781.

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

It is a cyclic number.

It is not a de Polignac number, because 18709397 - 2² = 18709393 is a prime.

It is a super-2 number, since 2×18709397² = 700083072207218, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18709391) 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, 9053 + ... + 10925.

It is an arithmetic number, because the mean of its divisors is an integer number (2676072).

Almost surely, 2^18709397 is an apocalyptic number.

It is an amenable number.

18709397 is a deficient number, since it is larger than the sum of its proper divisors (2699179).

18709397 is a wasteful number, since it uses less digits than its factorization.

18709397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3307.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 18709397 is about 4325.4360473830. The cubic root of 18709397 is about 265.4727387030.

The spelling of 18709397 in words is "eighteen million, seven hundred nine thousand, three hundred ninety-seven".