18880789 has 2 divisors, whose sum is σ = 18880790. Its totient is φ = 18880788.

The previous prime is 18880777. The next prime is 18880819. The reversal of 18880789 is 98708881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18879025 + 1764 = 4345^2 + 42^2 .

It is a cyclic number.

It is not a de Polignac number, because 18880789 - 2¹³ = 18872597 is a prime.

It is a Chen 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, 9440394 + 9440395.

It is an arithmetic number, because the mean of its divisors is an integer number (9440395).

Almost surely, 2^18880789 is an apocalyptic number.

It is an amenable number.

18880789 is a deficient number, since it is larger than the sum of its proper divisors (1).

18880789 is an equidigital number, since it uses as much as digits as its factorization.

18880789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 258048, while the sum is 49.

The square root of 18880789 is about 4345.2029872032. The cubic root of 18880789 is about 266.2809184781.

The spelling of 18880789 in words is "eighteen million, eight hundred eighty thousand, seven hundred eighty-nine".