18385733 has 2 divisors, whose sum is σ = 18385734. Its totient is φ = 18385732.

The previous prime is 18385729. The next prime is 18385747. The reversal of 18385733 is 33758381.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10640644 + 7745089 = 3262^2 + 2783^2 .

It is an emirp because it is prime and its reverse (33758381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18385733 - 2² = 18385729 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 (18385033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9192866 + 9192867.

It is an arithmetic number, because the mean of its divisors is an integer number (9192867).

Almost surely, 2^18385733 is an apocalyptic number.

It is an amenable number.

18385733 is a deficient number, since it is larger than the sum of its proper divisors (1).

18385733 is an equidigital number, since it uses as much as digits as its factorization.

18385733 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 18385733 is about 4287.8587896525. The cubic root of 18385733 is about 263.9329729212.

The spelling of 18385733 in words is "eighteen million, three hundred eighty-five thousand, seven hundred thirty-three".