18732900397 has 2 divisors, whose sum is σ = 18732900398. Its totient is φ = 18732900396.

The previous prime is 18732900343. The next prime is 18732900419. The reversal of 18732900397 is 79300923781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9672525801 + 9060374596 = 98349^2 + 95186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18732900397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18732900397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18732900097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9366450198 + 9366450199.

It is an arithmetic number, because the mean of its divisors is an integer number (9366450199).

Almost surely, 2^18732900397 is an apocalyptic number.

It is an amenable number.

18732900397 is a deficient number, since it is larger than the sum of its proper divisors (1).

18732900397 is an equidigital number, since it uses as much as digits as its factorization.

18732900397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 571536, while the sum is 49.

The spelling of 18732900397 in words is "eighteen billion, seven hundred thirty-two million, nine hundred thousand, three hundred ninety-seven".