2138887 has 4 divisors (see below), whose sum is σ = 2251480. Its totient is φ = 2026296.

The previous prime is 2138879. The next prime is 2138897. The reversal of 2138887 is 7888312.

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 2138887 - 2³ = 2138879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138867) 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, 56268 + ... + 56305.

It is an arithmetic number, because the mean of its divisors is an integer number (562870).

2^2138887 is an apocalyptic number.

2138887 is a deficient number, since it is larger than the sum of its proper divisors (112593).

2138887 is a wasteful number, since it uses less digits than its factorization.

2138887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112592.

The product of its digits is 21504, while the sum is 37.

The square root of 2138887 is about 1462.4934187886. The cubic root of 2138887 is about 128.8435296139.

It can be divided in two parts, 2138 and 887, that added together give a square (3025 = 55²).

The spelling of 2138887 in words is "two million, one hundred thirty-eight thousand, eight hundred eighty-seven".