139874237 has 2 divisors, whose sum is σ = 139874238. Its totient is φ = 139874236.

The previous prime is 139874233. The next prime is 139874239. The reversal of 139874237 is 732478931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114361636 + 25512601 = 10694^2 + 5051^2 .

It is a cyclic number.

It is not a de Polignac number, because 139874237 - 2² = 139874233 is a prime.

Together with 139874239, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139874233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69937118 + 69937119.

It is an arithmetic number, because the mean of its divisors is an integer number (69937119).

Almost surely, 2^139874237 is an apocalyptic number.

It is an amenable number.

139874237 is a deficient number, since it is larger than the sum of its proper divisors (1).

139874237 is an equidigital number, since it uses as much as digits as its factorization.

139874237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 44.

The square root of 139874237 is about 11826.8439154324. The cubic root of 139874237 is about 519.0938817870.

The spelling of 139874237 in words is "one hundred thirty-nine million, eight hundred seventy-four thousand, two hundred thirty-seven".