2153749 has 4 divisors (see below), whose sum is σ = 2319436. Its totient is φ = 1988064.

The previous prime is 2153737. The next prime is 2153773. The reversal of 2153749 is 9473512.

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 842724 + 1311025 = 918^2 + 1145^2 .

It is not a de Polignac number, because 2153749 - 2⁵ = 2153717 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2153749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2153729) 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, 82824 + ... + 82849.

It is an arithmetic number, because the mean of its divisors is an integer number (579859).

2^2153749 is an apocalyptic number.

It is an amenable number.

2153749 is a deficient number, since it is larger than the sum of its proper divisors (165687).

2153749 is a wasteful number, since it uses less digits than its factorization.

2153749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165686.

The product of its digits is 7560, while the sum is 31.

The square root of 2153749 is about 1467.5656714437. The cubic root of 2153749 is about 129.1412630351.

The spelling of 2153749 in words is "two million, one hundred fifty-three thousand, seven hundred forty-nine".