138442379 has 8 divisors (see below), whose sum is σ = 148200000. Its totient is φ = 128931912.

The previous prime is 138442361. The next prime is 138442391. The reversal of 138442379 is 973244831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138442379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138442349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60629 + ... + 62870.

It is an arithmetic number, because the mean of its divisors is an integer number (18525000).

Almost surely, 2^138442379 is an apocalyptic number.

138442379 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

138442379 is a deficient number, since it is larger than the sum of its proper divisors (9757621).

138442379 is a wasteful number, since it uses less digits than its factorization.

138442379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123577.

The product of its digits is 145152, while the sum is 41.

The square root of 138442379 is about 11766.1539595570. The cubic root of 138442379 is about 517.3165245322.

The spelling of 138442379 in words is "one hundred thirty-eight million, four hundred forty-two thousand, three hundred seventy-nine".