18223657 has 2 divisors, whose sum is σ = 18223658. Its totient is φ = 18223656.

The previous prime is 18223651. The next prime is 18223663. The reversal of 18223657 is 75632281.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (18223651) and next prime (18223663).

It can be written as a sum of positive squares in only one way, i.e., 10265616 + 7958041 = 3204^2 + 2821^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18223657 is a prime.

It is not a weakly prime, because it can be changed into another prime (18223651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9111828 + 9111829.

It is an arithmetic number, because the mean of its divisors is an integer number (9111829).

Almost surely, 2^18223657 is an apocalyptic number.

It is an amenable number.

18223657 is a deficient number, since it is larger than the sum of its proper divisors (1).

18223657 is an equidigital number, since it uses as much as digits as its factorization.

18223657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 34.

The square root of 18223657 is about 4268.9175442962. The cubic root of 18223657 is about 263.1551321556.

The spelling of 18223657 in words is "eighteen million, two hundred twenty-three thousand, six hundred fifty-seven".