138430669 has 4 divisors (see below), whose sum is σ = 149079196. Its totient is φ = 127782144.

The previous prime is 138430639. The next prime is 138430681. The reversal of 138430669 is 966034831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 966034831 = 79 ⋅12228289.

It can be written as a sum of positive squares in 2 ways, for example, as 22610025 + 115820644 = 4755^2 + 10762^2 .

It is a cyclic number.

It is not a de Polignac number, because 138430669 - 2¹¹ = 138428621 is a prime.

It is a super-2 number, since 2×138430669² = 38326100239575122, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138430639) 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, 5324244 + ... + 5324269.

It is an arithmetic number, because the mean of its divisors is an integer number (37269799).

Almost surely, 2^138430669 is an apocalyptic number.

It is an amenable number.

138430669 is a deficient number, since it is larger than the sum of its proper divisors (10648527).

138430669 is a wasteful number, since it uses less digits than its factorization.

138430669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10648526.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 138430669 is about 11765.6563352836. The cubic root of 138430669 is about 517.3019385666.

The spelling of 138430669 in words is "one hundred thirty-eight million, four hundred thirty thousand, six hundred sixty-nine".