139721851 has 8 divisors (see below), whose sum is σ = 140857920. Its totient is φ = 138590088.

The previous prime is 139721837. The next prime is 139721863. The reversal of 139721851 is 158127931.

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 139721851 - 2⁵ = 139721819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139721851.

It is not an unprimeable number, because it can be changed into a prime (139721651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97200 + ... + 98626.

It is an arithmetic number, because the mean of its divisors is an integer number (17607240).

Almost surely, 2^139721851 is an apocalyptic number.

139721851 is a deficient number, since it is larger than the sum of its proper divisors (1136069).

139721851 is a wasteful number, since it uses less digits than its factorization.

139721851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2153.

The product of its digits is 15120, while the sum is 37.

The square root of 139721851 is about 11820.3997817333. The cubic root of 139721851 is about 518.9053043299.

The spelling of 139721851 in words is "one hundred thirty-nine million, seven hundred twenty-one thousand, eight hundred fifty-one".