138741397 has 2 divisors, whose sum is σ = 138741398. Its totient is φ = 138741396.

The previous prime is 138741353. The next prime is 138741433. The reversal of 138741397 is 793147831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137381841 + 1359556 = 11721^2 + 1166^2 .

It is a cyclic number.

It is not a de Polignac number, because 138741397 - 2²⁷ = 4523669 is a prime.

It is a super-3 number, since 3×138741397³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138741347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69370698 + 69370699.

It is an arithmetic number, because the mean of its divisors is an integer number (69370699).

Almost surely, 2^138741397 is an apocalyptic number.

It is an amenable number.

138741397 is a deficient number, since it is larger than the sum of its proper divisors (1).

138741397 is an equidigital number, since it uses as much as digits as its factorization.

138741397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 43.

The square root of 138741397 is about 11778.8538067165. The cubic root of 138741397 is about 517.6887027602.

The spelling of 138741397 in words is "one hundred thirty-eight million, seven hundred forty-one thousand, three hundred ninety-seven".