18089623 has 2 divisors, whose sum is σ = 18089624. Its totient is φ = 18089622.

The previous prime is 18089597. The next prime is 18089677. The reversal of 18089623 is 32698081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18089623 - 2¹³ = 18081431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18089693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9044811 + 9044812.

It is an arithmetic number, because the mean of its divisors is an integer number (9044812).

Almost surely, 2^18089623 is an apocalyptic number.

18089623 is a deficient number, since it is larger than the sum of its proper divisors (1).

18089623 is an equidigital number, since it uses as much as digits as its factorization.

18089623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 18089623 is about 4253.1897441802. The cubic root of 18089623 is about 262.5083800802.

The spelling of 18089623 in words is "eighteen million, eighty-nine thousand, six hundred twenty-three".