138894709 has 8 divisors (see below), whose sum is σ = 147412440. Its totient is φ = 130415616.

The previous prime is 138894703. The next prime is 138894713. The reversal of 138894709 is 907498831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 49308484 + 89586225 = 7022^2 + 9465^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 138894709 - 2¹⁵ = 138861941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138894703) 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, 2074 + ... + 16795.

It is an arithmetic number, because the mean of its divisors is an integer number (18426555).

Almost surely, 2^138894709 is an apocalyptic number.

It is an amenable number.

138894709 is a deficient number, since it is larger than the sum of its proper divisors (8517731).

138894709 is a wasteful number, since it uses less digits than its factorization.

138894709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19319.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 138894709 is about 11785.3599435910. The cubic root of 138894709 is about 517.8793180000.

The spelling of 138894709 in words is "one hundred thirty-eight million, eight hundred ninety-four thousand, seven hundred nine".