138691283 has 4 divisors (see below), whose sum is σ = 138915960. Its totient is φ = 138466608.

The previous prime is 138691261. The next prime is 138691291. The reversal of 138691283 is 382196831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 382196831 = 107 ⋅3571933.

It is a cyclic number.

It is not a de Polignac number, because 138691283 - 2⁸ = 138691027 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138691283.

It is not an unprimeable number, because it can be changed into a prime (138691213) 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, 111410 + ... + 112647.

It is an arithmetic number, because the mean of its divisors is an integer number (34728990).

Almost surely, 2^138691283 is an apocalyptic number.

138691283 is a deficient number, since it is larger than the sum of its proper divisors (224677).

138691283 is an equidigital number, since it uses as much as digits as its factorization.

138691283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224676.

The product of its digits is 62208, while the sum is 41.

The square root of 138691283 is about 11776.7263278043. The cubic root of 138691283 is about 517.6263647787.

The spelling of 138691283 in words is "one hundred thirty-eight million, six hundred ninety-one thousand, two hundred eighty-three".