138966137 has 4 divisors (see below), whose sum is σ = 139037520. Its totient is φ = 138894756.

The previous prime is 138966103. The next prime is 138966167. The reversal of 138966137 is 731669831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138966137 - 2⁶ = 138966073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138966167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32687 + ... + 36692.

It is an arithmetic number, because the mean of its divisors is an integer number (34759380).

Almost surely, 2^138966137 is an apocalyptic number.

It is an amenable number.

138966137 is a deficient number, since it is larger than the sum of its proper divisors (71383).

138966137 is an equidigital number, since it uses as much as digits as its factorization.

138966137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71382.

The product of its digits is 163296, while the sum is 44.

The square root of 138966137 is about 11788.3899239888. The cubic root of 138966137 is about 517.9680776679.

The spelling of 138966137 in words is "one hundred thirty-eight million, nine hundred sixty-six thousand, one hundred thirty-seven".