2145749 has 4 divisors (see below), whose sum is σ = 2160300. Its totient is φ = 2131200.

The previous prime is 2145721. The next prime is 2145763. The reversal of 2145749 is 9475412.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1423249 + 722500 = 1193^2 + 850^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145749 - 2¹² = 2141653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145709) 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, 7052 + ... + 7349.

It is an arithmetic number, because the mean of its divisors is an integer number (540075).

2^2145749 is an apocalyptic number.

It is an amenable number.

2145749 is a deficient number, since it is larger than the sum of its proper divisors (14551).

2145749 is a wasteful number, since it uses less digits than its factorization.

2145749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14550.

The product of its digits is 10080, while the sum is 32.

The square root of 2145749 is about 1464.8375336535. The cubic root of 2145749 is about 128.9811682544.

The spelling of 2145749 in words is "two million, one hundred forty-five thousand, seven hundred forty-nine".