18980693 has 2 divisors, whose sum is σ = 18980694. Its totient is φ = 18980692.

The previous prime is 18980683. The next prime is 18980729. The reversal of 18980693 is 39608981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15382084 + 3598609 = 3922^2 + 1897^2 .

It is a cyclic number.

It is not a de Polignac number, because 18980693 - 2⁶ = 18980629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18980603) 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 as a sum of consecutive naturals, namely, 9490346 + 9490347.

It is an arithmetic number, because the mean of its divisors is an integer number (9490347).

Almost surely, 2^18980693 is an apocalyptic number.

It is an amenable number.

18980693 is a deficient number, since it is larger than the sum of its proper divisors (1).

18980693 is an equidigital number, since it uses as much as digits as its factorization.

18980693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 18980693 is about 4356.6837158554. The cubic root of 18980693 is about 266.7497503267.

The spelling of 18980693 in words is "eighteen million, nine hundred eighty thousand, six hundred ninety-three".