18953293 has 2 divisors, whose sum is σ = 18953294. Its totient is φ = 18953292.

The previous prime is 18953281. The next prime is 18953303. The reversal of 18953293 is 39235981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17867529 + 1085764 = 4227^2 + 1042^2 .

It is an emirp because it is prime and its reverse (39235981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18953293 is a prime.

It is a super-3 number, since 3×18953293³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18953243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9476646 + 9476647.

It is an arithmetic number, because the mean of its divisors is an integer number (9476647).

Almost surely, 2^18953293 is an apocalyptic number.

It is an amenable number.

18953293 is a deficient number, since it is larger than the sum of its proper divisors (1).

18953293 is an equidigital number, since it uses as much as digits as its factorization.

18953293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 40.

The square root of 18953293 is about 4353.5379865117. The cubic root of 18953293 is about 266.6213310083.

The spelling of 18953293 in words is "eighteen million, nine hundred fifty-three thousand, two hundred ninety-three".