138409137 has 6 divisors (see below), whose sum is σ = 199924322. Its totient is φ = 92272752.

The previous prime is 138409097. The next prime is 138409157. The reversal of 138409137 is 731904831.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 134583201 + 3825936 = 11601^2 + 1956^2 .

It is not a de Polignac number, because 138409137 - 2¹¹ = 138407089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138409157) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7689388 + ... + 7689405.

Almost surely, 2^138409137 is an apocalyptic number.

It is an amenable number.

138409137 is a deficient number, since it is larger than the sum of its proper divisors (61515185).

138409137 is a wasteful number, since it uses less digits than its factorization.

138409137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15378799 (or 15378796 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 138409137 is about 11764.7412636233. The cubic root of 138409137 is about 517.2751161797.

The spelling of 138409137 in words is "one hundred thirty-eight million, four hundred nine thousand, one hundred thirty-seven".