193942993 has 2 divisors, whose sum is σ = 193942994. Its totient is φ = 193942992.

The previous prime is 193942979. The next prime is 193942999. The reversal of 193942993 is 399249391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192016449 + 1926544 = 13857^2 + 1388^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-193942993 is a prime.

It is a super-2 number, since 2×193942993² = 75227769067596098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (193942999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96971496 + 96971497.

It is an arithmetic number, because the mean of its divisors is an integer number (96971497).

Almost surely, 2^193942993 is an apocalyptic number.

It is an amenable number.

193942993 is a deficient number, since it is larger than the sum of its proper divisors (1).

193942993 is an equidigital number, since it uses as much as digits as its factorization.

193942993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 472392, while the sum is 49.

The square root of 193942993 is about 13926.3416947883. The cubic root of 193942993 is about 578.8393286850.

The spelling of 193942993 in words is "one hundred ninety-three million, nine hundred forty-two thousand, nine hundred ninety-three".