18136397 has 8 divisors (see below), whose sum is σ = 19578240. Its totient is φ = 16749040.

The previous prime is 18136373. The next prime is 18136409. The reversal of 18136397 is 79363181.

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 18136397 - 2⁸ = 18136141 is a prime.

It is a super-2 number, since 2×18136397² = 657857792283218, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18136397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18136357) 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 7 ways as a sum of consecutive naturals, for example, 12929 + ... + 14262.

It is an arithmetic number, because the mean of its divisors is an integer number (2447280).

Almost surely, 2^18136397 is an apocalyptic number.

It is an amenable number.

18136397 is a deficient number, since it is larger than the sum of its proper divisors (1441843).

18136397 is a wasteful number, since it uses less digits than its factorization.

18136397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27243.

The product of its digits is 27216, while the sum is 38.

The square root of 18136397 is about 4258.6848909024. The cubic root of 18136397 is about 262.7344396895.

The spelling of 18136397 in words is "eighteen million, one hundred thirty-six thousand, three hundred ninety-seven".