2139784 has 16 divisors (see below), whose sum is σ = 4121100. Its totient is φ = 1040832.

The previous prime is 2139757. The next prime is 2139811. The reversal of 2139784 is 4879312.

2139784 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.

It is an interprime number because it is at equal distance from previous prime (2139757) and next prime (2139811).

It can be written as a sum of positive squares in 2 ways, for example, as 1464100 + 675684 = 1210^2 + 822^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3319 + ... + 3910.

2^2139784 is an apocalyptic number.

It is an amenable number.

2139784 is a deficient number, since it is larger than the sum of its proper divisors (1981316).

2139784 is a wasteful number, since it uses less digits than its factorization.

2139784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7272 (or 7268 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 2139784 is about 1462.8000546896. The cubic root of 2139784 is about 128.8615384341.

The spelling of 2139784 in words is "two million, one hundred thirty-nine thousand, seven hundred eighty-four".