139739638 has 8 divisors (see below), whose sum is σ = 210425832. Its totient is φ = 69597696.

The previous prime is 139739629. The next prime is 139739647. The reversal of 139739638 is 836937931.

It is an interprime number because it is at equal distance from previous prime (139739629) and next prime (139739647).

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

It is a junction number, because it is equal to n+sod(n) for n = 139739591 and 139739600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135420 + ... + 136447.

It is an arithmetic number, because the mean of its divisors is an integer number (26303229).

Almost surely, 2^139739638 is an apocalyptic number.

139739638 is a deficient number, since it is larger than the sum of its proper divisors (70686194).

139739638 is a wasteful number, since it uses less digits than its factorization.

139739638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272126.

The product of its digits is 734832, while the sum is 49.

The square root of 139739638 is about 11821.1521435095. The cubic root of 139739638 is about 518.9273227829.

The spelling of 139739638 in words is "one hundred thirty-nine million, seven hundred thirty-nine thousand, six hundred thirty-eight".