139428638 has 8 divisors (see below), whose sum is σ = 215889600. Its totient is φ = 67465440.

The previous prime is 139428571. The next prime is 139428643. The reversal of 139428638 is 836824931.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1124363 + ... + 1124486.

It is an arithmetic number, because the mean of its divisors is an integer number (26986200).

Almost surely, 2^139428638 is an apocalyptic number.

139428638 is a deficient number, since it is larger than the sum of its proper divisors (76460962).

139428638 is a wasteful number, since it uses less digits than its factorization.

139428638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2248882.

The product of its digits is 248832, while the sum is 44.

The square root of 139428638 is about 11807.9904302129. The cubic root of 139428638 is about 518.5420675721.

The spelling of 139428638 in words is "one hundred thirty-nine million, four hundred twenty-eight thousand, six hundred thirty-eight".