18000000397 has 8 divisors (see below), whose sum is σ = 18341614080. Its totient is φ = 17658460560.

The previous prime is 18000000391. The next prime is 18000000433. The reversal of 18000000397 is 79300000081.

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 18000000397 - 2⁷ = 18000000269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18000000391) 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, 942372 + ... + 961282.

It is an arithmetic number, because the mean of its divisors is an integer number (2292701760).

Almost surely, 2^18000000397 is an apocalyptic number.

It is an amenable number.

18000000397 is a deficient number, since it is larger than the sum of its proper divisors (341613683).

18000000397 is a wasteful number, since it uses less digits than its factorization.

18000000397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36923.

The product of its (nonzero) digits is 1512, while the sum is 28.

The spelling of 18000000397 in words is "eighteen billion, three hundred ninety-seven", and thus it is an aban number.