138949259 has 2 divisors, whose sum is σ = 138949260. Its totient is φ = 138949258.

The previous prime is 138949247. The next prime is 138949271. The reversal of 138949259 is 952949831.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (138949247) and next prime (138949271).

It is a cyclic number.

It is not a de Polignac number, because 138949259 - 2⁴ = 138949243 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (138949219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69474629 + 69474630.

It is an arithmetic number, because the mean of its divisors is an integer number (69474630).

Almost surely, 2^138949259 is an apocalyptic number.

138949259 is a deficient number, since it is larger than the sum of its proper divisors (1).

138949259 is an equidigital number, since it uses as much as digits as its factorization.

138949259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 699840, while the sum is 50.

The square root of 138949259 is about 11787.6740284078. The cubic root of 138949259 is about 517.9471070454.

The spelling of 138949259 in words is "one hundred thirty-eight million, nine hundred forty-nine thousand, two hundred fifty-nine".