18780623 has 2 divisors, whose sum is σ = 18780624. Its totient is φ = 18780622.

The previous prime is 18780617. The next prime is 18780667. The reversal of 18780623 is 32608781.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18780623 - 2¹⁶ = 18715087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18780523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9390311 + 9390312.

It is an arithmetic number, because the mean of its divisors is an integer number (9390312).

Almost surely, 2^18780623 is an apocalyptic number.

18780623 is a deficient number, since it is larger than the sum of its proper divisors (1).

18780623 is an equidigital number, since it uses as much as digits as its factorization.

18780623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 18780623 is about 4333.6616157702. The cubic root of 18780623 is about 265.8091938218.

The spelling of 18780623 in words is "eighteen million, seven hundred eighty thousand, six hundred twenty-three".