2139281 has 8 divisors (see below), whose sum is σ = 2203200. Its totient is φ = 2076400.

The previous prime is 2139233. The next prime is 2139283. The reversal of 2139281 is 1829312.

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 2139281 - 2¹⁸ = 1877137 is a prime.

It is a super-2 number, since 2×2139281² = 9153046393922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2139281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5780 + ... + 6138.

It is an arithmetic number, because the mean of its divisors is an integer number (275400).

2^2139281 is an apocalyptic number.

It is an amenable number.

2139281 is a deficient number, since it is larger than the sum of its proper divisors (63919).

2139281 is a wasteful number, since it uses less digits than its factorization.

2139281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519.

The product of its digits is 864, while the sum is 26.

The square root of 2139281 is about 1462.6281140468. The cubic root of 2139281 is about 128.8514404626.

The spelling of 2139281 in words is "two million, one hundred thirty-nine thousand, two hundred eighty-one".