618623393 has 2 divisors, whose sum is σ = 618623394. Its totient is φ = 618623392.

The previous prime is 618623371. The next prime is 618623419. The reversal of 618623393 is 393326816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 515153809 + 103469584 = 22697^2 + 10172^2 .

It is a cyclic number.

It is not a de Polignac number, because 618623393 - 2¹⁴ = 618607009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 618623393.

It is not a weakly prime, because it can be changed into another prime (618623303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309311696 + 309311697.

It is an arithmetic number, because the mean of its divisors is an integer number (309311697).

Almost surely, 2^618623393 is an apocalyptic number.

It is an amenable number.

618623393 is a deficient number, since it is larger than the sum of its proper divisors (1).

618623393 is an equidigital number, since it uses as much as digits as its factorization.

618623393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 41.

The square root of 618623393 is about 24872.1409010161. The cubic root of 618623393 is about 852.0703363689.

The spelling of 618623393 in words is "six hundred eighteen million, six hundred twenty-three thousand, three hundred ninety-three".