2120749 has 4 divisors (see below), whose sum is σ = 2123836. Its totient is φ = 2117664.

The previous prime is 2120747. The next prime is 2120753. The reversal of 2120749 is 9470212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1671849 + 448900 = 1293^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120749 - 2¹ = 2120747 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 (2120747) 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, 7 + ... + 2059.

It is an arithmetic number, because the mean of its divisors is an integer number (530959).

2^2120749 is an apocalyptic number.

It is an amenable number.

2120749 is a deficient number, since it is larger than the sum of its proper divisors (3087).

2120749 is a wasteful number, since it uses less digits than its factorization.

2120749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3086.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 2120749 is about 1456.2791627981. The cubic root of 2120749 is about 128.4782927495.

The spelling of 2120749 in words is "two million, one hundred twenty thousand, seven hundred forty-nine".