138889394 has 8 divisors (see below), whose sum is σ = 238096128. Its totient is φ = 59524020.

The previous prime is 138889369. The next prime is 138889409. The reversal of 138889394 is 493988831.

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4960322 + ... + 4960349.

It is an arithmetic number, because the mean of its divisors is an integer number (29762016).

Almost surely, 2^138889394 is an apocalyptic number.

138889394 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

138889394 is a deficient number, since it is larger than the sum of its proper divisors (99206734).

138889394 is an equidigital number, since it uses as much as digits as its factorization.

138889394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9920680.

The product of its digits is 1492992, while the sum is 53.

The square root of 138889394 is about 11785.1344498058. The cubic root of 138889394 is about 517.8727121239.

The spelling of 138889394 in words is "one hundred thirty-eight million, eight hundred eighty-nine thousand, three hundred ninety-four".