138764569 has 8 divisors (see below), whose sum is σ = 144322112. Its totient is φ = 133313040.

The previous prime is 138764567. The next prime is 138764573. The reversal of 138764569 is 965467831.

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 138764569 - 2¹ = 138764567 is a prime.

It is a super-2 number, since 2×138764569² = 38511211219511522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138764567) 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, 23829 + ... + 29074.

It is an arithmetic number, because the mean of its divisors is an integer number (18040264).

Almost surely, 2^138764569 is an apocalyptic number.

It is an amenable number.

138764569 is a deficient number, since it is larger than the sum of its proper divisors (5557543).

138764569 is an equidigital number, since it uses as much as digits as its factorization.

138764569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53007.

The product of its digits is 1088640, while the sum is 49.

The square root of 138764569 is about 11779.8373927657. The cubic root of 138764569 is about 517.7175218801.

It can be divided in two parts, 1387 and 64569, that added together give a palindrome (65956).

The spelling of 138764569 in words is "one hundred thirty-eight million, seven hundred sixty-four thousand, five hundred sixty-nine".