138513737 has 4 divisors (see below), whose sum is σ = 140784516. Its totient is φ = 136242960.

The previous prime is 138513733. The next prime is 138513761. The reversal of 138513737 is 737315831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67634176 + 70879561 = 8224^2 + 8419^2 .

It is a cyclic number.

It is not a de Polignac number, because 138513737 - 2² = 138513733 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 138513737.

It is not an unprimeable number, because it can be changed into a prime (138513731) 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, 1135298 + ... + 1135419.

It is an arithmetic number, because the mean of its divisors is an integer number (35196129).

Almost surely, 2^138513737 is an apocalyptic number.

It is an amenable number.

138513737 is a deficient number, since it is larger than the sum of its proper divisors (2270779).

138513737 is an equidigital number, since it uses as much as digits as its factorization.

138513737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270778.

The product of its digits is 52920, while the sum is 38.

The square root of 138513737 is about 11769.1859106737. The cubic root of 138513737 is about 517.4053902207.

The spelling of 138513737 in words is "one hundred thirty-eight million, five hundred thirteen thousand, seven hundred thirty-seven".