138738611 has 8 divisors (see below), whose sum is σ = 151588800. Its totient is φ = 125928040.

The previous prime is 138738569. The next prime is 138738659. The reversal of 138738611 is 116837831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138738611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138738011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2321 + ... + 16818.

It is an arithmetic number, because the mean of its divisors is an integer number (18948600).

Almost surely, 2^138738611 is an apocalyptic number.

138738611 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

138738611 is a deficient number, since it is larger than the sum of its proper divisors (12850189).

138738611 is a wasteful number, since it uses less digits than its factorization.

138738611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19809.

The product of its digits is 24192, while the sum is 38.

The square root of 138738611 is about 11778.7355433425. The cubic root of 138738611 is about 517.6852375835.

The spelling of 138738611 in words is "one hundred thirty-eight million, seven hundred thirty-eight thousand, six hundred eleven".