138436669 has 16 divisors (see below), whose sum is σ = 163741696. Its totient is φ = 114534000.

The previous prime is 138436663. The next prime is 138436699. The reversal of 138436669 is 966634831.

It is not a de Polignac number, because 138436669 - 2⁵ = 138436637 is a prime.

It is a super-2 number, since 2×138436669² = 38329422647631122, 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 (138436663) 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, 131194 + ... + 132244.

It is an arithmetic number, because the mean of its divisors is an integer number (10233856).

Almost surely, 2^138436669 is an apocalyptic number.

It is an amenable number.

138436669 is a deficient number, since it is larger than the sum of its proper divisors (25305027).

138436669 is a wasteful number, since it uses less digits than its factorization.

138436669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696.

The product of its digits is 559872, while the sum is 46.

The square root of 138436669 is about 11765.9113119214. The cubic root of 138436669 is about 517.3094122640.

The spelling of 138436669 in words is "one hundred thirty-eight million, four hundred thirty-six thousand, six hundred sixty-nine".