138897583 has 16 divisors (see below), whose sum is σ = 154046880. Its totient is φ = 124185600.

The previous prime is 138897571. The next prime is 138897589. The reversal of 138897583 is 385798831.

138897583 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-138897583 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 138897583.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138897589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 329713 + ... + 330133.

It is an arithmetic number, because the mean of its divisors is an integer number (9627930).

Almost surely, 2^138897583 is an apocalyptic number.

138897583 is a deficient number, since it is larger than the sum of its proper divisors (15149297).

138897583 is a wasteful number, since it uses less digits than its factorization.

138897583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858.

The product of its digits is 1451520, while the sum is 52.

The square root of 138897583 is about 11785.4818738989. The cubic root of 138897583 is about 517.8828899500.

The spelling of 138897583 in words is "one hundred thirty-eight million, eight hundred ninety-seven thousand, five hundred eighty-three".