138470399 has 4 divisors (see below), whose sum is σ = 138638664. Its totient is φ = 138302136.

The previous prime is 138470351. The next prime is 138470401. The reversal of 138470399 is 993074831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138470399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138470599) 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, 82892 + ... + 84545.

It is an arithmetic number, because the mean of its divisors is an integer number (34659666).

Almost surely, 2^138470399 is an apocalyptic number.

138470399 is a deficient number, since it is larger than the sum of its proper divisors (168265).

138470399 is an equidigital number, since it uses as much as digits as its factorization.

138470399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168264.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 138470399 is about 11767.3446027555. The cubic root of 138470399 is about 517.3514228808.

The spelling of 138470399 in words is "one hundred thirty-eight million, four hundred seventy thousand, three hundred ninety-nine".