2155749 has 8 divisors (see below), whose sum is σ = 2935680. Its totient is φ = 1406496.

The previous prime is 2155733. The next prime is 2155781. The reversal of 2155749 is 9475512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2155749 - 2⁴ = 2155733 is a prime.

It is a d-powerful number, because it can be written as 2⁵ + 1 + 5⁷ + 5⁹ + 7⁶ + 4⁴ + 9⁴ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7504 + ... + 7785.

It is an arithmetic number, because the mean of its divisors is an integer number (366960).

2^2155749 is an apocalyptic number.

It is an amenable number.

2155749 is a deficient number, since it is larger than the sum of its proper divisors (779931).

2155749 is a wasteful number, since it uses less digits than its factorization.

2155749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15339.

The product of its digits is 12600, while the sum is 33.

The square root of 2155749 is about 1468.2469138398. The cubic root of 2155749 is about 129.1812247668.

The spelling of 2155749 in words is "two million, one hundred fifty-five thousand, seven hundred forty-nine".