139971605 has 8 divisors (see below), whose sum is σ = 168707232. Its totient is φ = 111483088.

The previous prime is 139971589. The next prime is 139971617. The reversal of 139971605 is 506179931.

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

It is a cyclic number.

It is not a de Polignac number, because 139971605 - 2⁴ = 139971589 is a prime.

It is a Duffinian number.

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 60527 + ... + 62796.

It is an arithmetic number, because the mean of its divisors is an integer number (21088404).

Almost surely, 2^139971605 is an apocalyptic number.

It is an amenable number.

139971605 is a deficient number, since it is larger than the sum of its proper divisors (28735627).

139971605 is a wasteful number, since it uses less digits than its factorization.

139971605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123555.

The product of its (nonzero) digits is 51030, while the sum is 41.

The square root of 139971605 is about 11830.9595975982. The cubic root of 139971605 is about 519.2143028424.

The spelling of 139971605 in words is "one hundred thirty-nine million, nine hundred seventy-one thousand, six hundred five".