393841157 has 2 divisors, whose sum is σ = 393841158. Its totient is φ = 393841156.

The previous prime is 393841111. The next prime is 393841187. The reversal of 393841157 is 751148393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 388523521 + 5317636 = 19711^2 + 2306^2 .

It is an emirp because it is prime and its reverse (751148393) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 393841157 - 2¹² = 393837061 is a prime.

It is a super-2 number, since 2×393841157² = 310221713894197298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (393841187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196920578 + 196920579.

It is an arithmetic number, because the mean of its divisors is an integer number (196920579).

Almost surely, 2^393841157 is an apocalyptic number.

It is an amenable number.

393841157 is a deficient number, since it is larger than the sum of its proper divisors (1).

393841157 is an equidigital number, since it uses as much as digits as its factorization.

393841157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 393841157 is about 19845.4316405565. The cubic root of 393841157 is about 733.0051616798.

The spelling of 393841157 in words is "three hundred ninety-three million, eight hundred forty-one thousand, one hundred fifty-seven".