138020869 has 4 divisors (see below), whose sum is σ = 157738144. Its totient is φ = 118303596.

The previous prime is 138020863. The next prime is 138020879. The reversal of 138020869 is 968020831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138020869 - 2⁵ = 138020837 is a prime.

It is a super-2 number, since 2×138020869² = 38099520559030322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138020863) 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, 9858627 + ... + 9858640.

It is an arithmetic number, because the mean of its divisors is an integer number (39434536).

Almost surely, 2^138020869 is an apocalyptic number.

It is an amenable number.

138020869 is a deficient number, since it is larger than the sum of its proper divisors (19717275).

138020869 is an equidigital number, since it uses as much as digits as its factorization.

138020869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19717274.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 138020869 is about 11748.2283345192. The cubic root of 138020869 is about 516.7909731196.

The spelling of 138020869 in words is "one hundred thirty-eight million, twenty thousand, eight hundred sixty-nine".