138647642 has 16 divisors (see below), whose sum is σ = 239199360. Its totient is φ = 59041008.

The previous prime is 138647633. The next prime is 138647651. The reversal of 138647642 is 246746831.

It is an interprime number because it is at equal distance from previous prime (138647633) and next prime (138647651).

It is a self number, because there is not a number n which added to its sum of digits gives 138647642.

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 7 ways as a sum of consecutive naturals, for example, 29342 + ... + 33737.

It is an arithmetic number, because the mean of its divisors is an integer number (14949960).

Almost surely, 2^138647642 is an apocalyptic number.

138647642 is a deficient number, since it is larger than the sum of its proper divisors (100551718).

138647642 is a wasteful number, since it uses less digits than its factorization.

138647642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63245.

The product of its digits is 193536, while the sum is 41.

The square root of 138647642 is about 11774.8733326520. The cubic root of 138647642 is about 517.5720664804.

The spelling of 138647642 in words is "one hundred thirty-eight million, six hundred forty-seven thousand, six hundred forty-two".