2139257 has 4 divisors (see below), whose sum is σ = 2191476. Its totient is φ = 2087040.

The previous prime is 2139233. The next prime is 2139283. The reversal of 2139257 is 7529312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33856 + 2105401 = 184^2 + 1451^2 .

It is a cyclic number.

It is not a de Polignac number, because 2139257 - 2¹⁴ = 2122873 is a prime.

It is a d-powerful number, because it can be written as 2⁹ + 1 + 3¹⁰ + 9³ + 2¹³ + 5⁹ + 7⁶ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2139227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26048 + ... + 26129.

It is an arithmetic number, because the mean of its divisors is an integer number (547869).

2^2139257 is an apocalyptic number.

It is an amenable number.

2139257 is a deficient number, since it is larger than the sum of its proper divisors (52219).

2139257 is an equidigital number, since it uses as much as digits as its factorization.

2139257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52218.

The product of its digits is 3780, while the sum is 29.

The square root of 2139257 is about 1462.6199096143. The cubic root of 2139257 is about 128.8509586113.

The spelling of 2139257 in words is "two million, one hundred thirty-nine thousand, two hundred fifty-seven".