139963427 has 2 divisors, whose sum is σ = 139963428. Its totient is φ = 139963426.

The previous prime is 139963423. The next prime is 139963429. The reversal of 139963427 is 724369931.

It is a strong prime.

It is an emirp because it is prime and its reverse (724369931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139963427 - 2² = 139963423 is a prime.

Together with 139963429, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139963423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69981713 + 69981714.

It is an arithmetic number, because the mean of its divisors is an integer number (69981714).

Almost surely, 2^139963427 is an apocalyptic number.

139963427 is a deficient number, since it is larger than the sum of its proper divisors (1).

139963427 is an equidigital number, since it uses as much as digits as its factorization.

139963427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 44.

The square root of 139963427 is about 11830.6139739238. The cubic root of 139963427 is about 519.2041907504.

The spelling of 139963427 in words is "one hundred thirty-nine million, nine hundred sixty-three thousand, four hundred twenty-seven".