138428379 has 8 divisors (see below), whose sum is σ = 205079120. Its totient is φ = 92285568.

The previous prime is 138428377. The next prime is 138428383. The reversal of 138428379 is 973824831.

138428379 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138428379 - 2¹ = 138428377 is a prime.

It is a super-2 number, since 2×138428379² = 38324832225135282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138428371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2563462 + ... + 2563515.

It is an arithmetic number, because the mean of its divisors is an integer number (25634890).

Almost surely, 2^138428379 is an apocalyptic number.

138428379 is a deficient number, since it is larger than the sum of its proper divisors (66650741).

138428379 is an equidigital number, since it uses as much as digits as its factorization.

138428379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5126986 (or 5126980 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 138428379 is about 11765.5590177433. The cubic root of 138428379 is about 517.2990860485.

The spelling of 138428379 in words is "one hundred thirty-eight million, four hundred twenty-eight thousand, three hundred seventy-nine".