139794427 has 2 divisors, whose sum is σ = 139794428. Its totient is φ = 139794426.

The previous prime is 139794377. The next prime is 139794439. The reversal of 139794427 is 724497931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139794427 - 2¹¹ = 139792379 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139794827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69897213 + 69897214.

It is an arithmetic number, because the mean of its divisors is an integer number (69897214).

Almost surely, 2^139794427 is an apocalyptic number.

139794427 is a deficient number, since it is larger than the sum of its proper divisors (1).

139794427 is an equidigital number, since it uses as much as digits as its factorization.

139794427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 46.

The square root of 139794427 is about 11823.4693301078. The cubic root of 139794427 is about 518.9951341176.

The spelling of 139794427 in words is "one hundred thirty-nine million, seven hundred ninety-four thousand, four hundred twenty-seven".