138420299 has 4 divisors (see below), whose sum is σ = 139690320. Its totient is φ = 137150280.

The previous prime is 138420283. The next prime is 138420323. The reversal of 138420299 is 992024831.

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

It is a cyclic number.

It is not a de Polignac number, because 138420299 - 2⁴ = 138420283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138420209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 634847 + ... + 635064.

It is an arithmetic number, because the mean of its divisors is an integer number (34922580).

Almost surely, 2^138420299 is an apocalyptic number.

138420299 is a deficient number, since it is larger than the sum of its proper divisors (1270021).

138420299 is a wasteful number, since it uses less digits than its factorization.

138420299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270020.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 138420299 is about 11765.2156376328. The cubic root of 138420299 is about 517.2890210171.

The spelling of 138420299 in words is "one hundred thirty-eight million, four hundred twenty thousand, two hundred ninety-nine".