18930641 has 2 divisors, whose sum is σ = 18930642. Its totient is φ = 18930640.

The previous prime is 18930623. The next prime is 18930661. The reversal of 18930641 is 14603981.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11662225 + 7268416 = 3415^2 + 2696^2 .

It is a cyclic number.

It is not a de Polignac number, because 18930641 - 2⁶ = 18930577 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18930598 and 18930607.

It is not a weakly prime, because it can be changed into another prime (18930661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9465320 + 9465321.

It is an arithmetic number, because the mean of its divisors is an integer number (9465321).

Almost surely, 2^18930641 is an apocalyptic number.

It is an amenable number.

18930641 is a deficient number, since it is larger than the sum of its proper divisors (1).

18930641 is an equidigital number, since it uses as much as digits as its factorization.

18930641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 18930641 is about 4350.9356465018. The cubic root of 18930641 is about 266.5150713023.

The spelling of 18930641 in words is "eighteen million, nine hundred thirty thousand, six hundred forty-one".