2139851 has 8 divisors (see below), whose sum is σ = 2552064. Its totient is φ = 1754280.

The previous prime is 2139829. The next prime is 2139857. The reversal of 2139851 is 1589312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2139851 is a prime.

It is a d-powerful number, because it can be written as 2²¹ + 1 + 3⁵ + 9⁴ + 8⁵ + 5⁵ + 1 .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6485 + ... + 6806.

It is an arithmetic number, because the mean of its divisors is an integer number (319008).

2^2139851 is an apocalyptic number.

2139851 is a deficient number, since it is larger than the sum of its proper divisors (412213).

2139851 is a wasteful number, since it uses less digits than its factorization.

2139851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13321.

The product of its digits is 2160, while the sum is 29.

The square root of 2139851 is about 1462.8229557947. The cubic root of 2139851 is about 128.8628833724.

The spelling of 2139851 in words is "two million, one hundred thirty-nine thousand, eight hundred fifty-one".