2139887 has 4 divisors (see below), whose sum is σ = 2161176. Its totient is φ = 2118600.

The previous prime is 2139877. The next prime is 2139911. The reversal of 2139887 is 7889312.

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

It is a cyclic number.

It is not a de Polignac number, because 2139887 - 2¹⁶ = 2074351 is a prime.

It is a super-4 number, since 4×2139887⁴ (a number of 26 digits) contains 4444 as substring.

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 2139887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139817) 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, 10493 + ... + 10694.

It is an arithmetic number, because the mean of its divisors is an integer number (540294).

2^2139887 is an apocalyptic number.

2139887 is a deficient number, since it is larger than the sum of its proper divisors (21289).

2139887 is a wasteful number, since it uses less digits than its factorization.

2139887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21288.

The product of its digits is 24192, while the sum is 38.

The square root of 2139887 is about 1462.8352607180. The cubic root of 2139887 is about 128.8636060143.

The spelling of 2139887 in words is "two million, one hundred thirty-nine thousand, eight hundred eighty-seven".