783994157 has 2 divisors, whose sum is σ = 783994158. Its totient is φ = 783994156.

The previous prime is 783994097. The next prime is 783994171. The reversal of 783994157 is 751499387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 436768201 + 347225956 = 20899^2 + 18634^2 .

It is a cyclic number.

It is not a de Polignac number, because 783994157 - 2¹⁸ = 783732013 is a prime.

It is a super-2 number, since 2×783994157² = 1229293676420281298, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 783994099 and 783994108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (783994957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 391997078 + 391997079.

It is an arithmetic number, because the mean of its divisors is an integer number (391997079).

Almost surely, 2^783994157 is an apocalyptic number.

It is an amenable number.

783994157 is a deficient number, since it is larger than the sum of its proper divisors (1).

783994157 is an equidigital number, since it uses as much as digits as its factorization.

783994157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 53.

The square root of 783994157 is about 27999.8956605199. The cubic root of 783994157 is about 922.0849676935.

The spelling of 783994157 in words is "seven hundred eighty-three million, nine hundred ninety-four thousand, one hundred fifty-seven".