138399069 has 16 divisors (see below), whose sum is σ = 189297152. Its totient is φ = 89894448.

The previous prime is 138399061. The next prime is 138399071. The reversal of 138399069 is 960993831.

It is a happy number.

It is not a de Polignac number, because 138399069 - 2³ = 138399061 is a prime.

It is a super-2 number, since 2×138399069² = 38308604600133522, 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 (138399061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61722 + ... + 63924.

It is an arithmetic number, because the mean of its divisors is an integer number (11831072).

Almost surely, 2^138399069 is an apocalyptic number.

It is an amenable number.

138399069 is a deficient number, since it is larger than the sum of its proper divisors (50898083).

138399069 is a wasteful number, since it uses less digits than its factorization.

138399069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736.

The product of its (nonzero) digits is 314928, while the sum is 48.

The square root of 138399069 is about 11764.3133671286. The cubic root of 138399069 is about 517.2625735296.

The spelling of 138399069 in words is "one hundred thirty-eight million, three hundred ninety-nine thousand, sixty-nine".