2750921 has 4 divisors (see below), whose sum is σ = 2761344. Its totient is φ = 2740500.

The previous prime is 2750903. The next prime is 2750933. The reversal of 2750921 is 1290572.

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.

It is a cyclic number.

It is not a de Polignac number, because 2750921 - 2⁶ = 2750857 is a prime.

It is a super-3 number, since 3×2750921³ = 62453331558808439883, which contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2750981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4805 + ... + 5346.

It is an arithmetic number, because the mean of its divisors is an integer number (690336).

2^2750921 is an apocalyptic number.

It is an amenable number.

2750921 is a deficient number, since it is larger than the sum of its proper divisors (10423).

2750921 is a wasteful number, since it uses less digits than its factorization.

2750921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10422.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 2750921 is about 1658.5900638796. The cubic root of 2750921 is about 140.1176052611.

The spelling of 2750921 in words is "two million, seven hundred fifty thousand, nine hundred twenty-one".