18880733 has 2 divisors, whose sum is σ = 18880734. Its totient is φ = 18880732.

The previous prime is 18880717. The next prime is 18880739. The reversal of 18880733 is 33708881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9504889 + 9375844 = 3083^2 + 3062^2 .

It is an emirp because it is prime and its reverse (33708881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18880733 - 2⁴ = 18880717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18880739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9440366 + 9440367.

It is an arithmetic number, because the mean of its divisors is an integer number (9440367).

Almost surely, 2^18880733 is an apocalyptic number.

It is an amenable number.

18880733 is a deficient number, since it is larger than the sum of its proper divisors (1).

18880733 is an equidigital number, since it uses as much as digits as its factorization.

18880733 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 18880733 is about 4345.1965433108. The cubic root of 18880733 is about 266.2806552167.

The spelling of 18880733 in words is "eighteen million, eight hundred eighty thousand, seven hundred thirty-three".