18900823 has 2 divisors, whose sum is σ = 18900824. Its totient is φ = 18900822.

The previous prime is 18900797. The next prime is 18900851. The reversal of 18900823 is 32800981.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18900823 is a prime.

It is a super-2 number, since 2×18900823² = 714482220154658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18900853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9450411 + 9450412.

It is an arithmetic number, because the mean of its divisors is an integer number (9450412).

Almost surely, 2^18900823 is an apocalyptic number.

18900823 is a deficient number, since it is larger than the sum of its proper divisors (1).

18900823 is an equidigital number, since it uses as much as digits as its factorization.

18900823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 18900823 is about 4347.5076768190. The cubic root of 18900823 is about 266.3750668423.

The spelling of 18900823 in words is "eighteen million, nine hundred thousand, eight hundred twenty-three".