138733737 has 4 divisors (see below), whose sum is σ = 184978320. Its totient is φ = 92489156.

The previous prime is 138733733. The next prime is 138733741. The reversal of 138733737 is 737337831.

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, and also an emirpimes, since its reverse is a distinct semiprime: 737337831 = 3 ⋅245779277.

It is an interprime number because it is at equal distance from previous prime (138733733) and next prime (138733741).

It is a cyclic number.

It is not a de Polignac number, because 138733737 - 2² = 138733733 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138733733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23122287 + ... + 23122292.

It is an arithmetic number, because the mean of its divisors is an integer number (46244580).

Almost surely, 2^138733737 is an apocalyptic number.

It is an amenable number.

138733737 is a deficient number, since it is larger than the sum of its proper divisors (46244583).

138733737 is an equidigital number, since it uses as much as digits as its factorization.

138733737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46244582.

The product of its digits is 222264, while the sum is 42.

The square root of 138733737 is about 11778.5286432559. The cubic root of 138733737 is about 517.6791752783.

The spelling of 138733737 in words is "one hundred thirty-eight million, seven hundred thirty-three thousand, seven hundred thirty-seven".