2138761 has 4 divisors (see below), whose sum is σ = 2141712. Its totient is φ = 2135812.

The previous prime is 2138749. The next prime is 2138789. The reversal of 2138761 is 1678312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2138761 - 2⁹ = 2138249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2138861) 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 3 ways as a sum of consecutive naturals, for example, 450 + ... + 2116.

It is an arithmetic number, because the mean of its divisors is an integer number (535428).

2^2138761 is an apocalyptic number.

It is an amenable number.

2138761 is a deficient number, since it is larger than the sum of its proper divisors (2951).

2138761 is a wasteful number, since it uses less digits than its factorization.

2138761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2950.

The product of its digits is 2016, while the sum is 28.

The square root of 2138761 is about 1462.4503410373. The cubic root of 2138761 is about 128.8409995436.

The spelling of 2138761 in words is "two million, one hundred thirty-eight thousand, seven hundred sixty-one".