18240773 has 2 divisors, whose sum is σ = 18240774. Its totient is φ = 18240772.

The previous prime is 18240767. The next prime is 18240787. The reversal of 18240773 is 37704281.

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., 17833729 + 407044 = 4223^2 + 638^2 .

It is a cyclic number.

It is not a de Polignac number, because 18240773 - 2⁴ = 18240757 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18240713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9120386 + 9120387.

It is an arithmetic number, because the mean of its divisors is an integer number (9120387).

Almost surely, 2^18240773 is an apocalyptic number.

It is an amenable number.

18240773 is a deficient number, since it is larger than the sum of its proper divisors (1).

18240773 is an equidigital number, since it uses as much as digits as its factorization.

18240773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 18240773 is about 4270.9217974578. The cubic root of 18240773 is about 263.2374931190.

The spelling of 18240773 in words is "eighteen million, two hundred forty thousand, seven hundred seventy-three".