2724921 has 10 divisors (see below), whose sum is σ = 4070682. Its totient is φ = 1816560.

The previous prime is 2724877. The next prime is 2724929. The reversal of 2724921 is 1294272.

It can be written as a sum of positive squares in only one way, i.e., 2595321 + 129600 = 1611^2 + 360^2 .

It is not a de Polignac number, because 2724921 - 2¹³ = 2716729 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2724929) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 16740 + ... + 16901.

2^2724921 is an apocalyptic number.

It is an amenable number.

2724921 is a deficient number, since it is larger than the sum of its proper divisors (1345761).

2724921 is an equidigital number, since it uses as much as digits as its factorization.

2724921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33653 (or 33644 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 2724921 is about 1650.7334733384. The cubic root of 2724921 is about 139.6747722740.

The spelling of 2724921 in words is "two million, seven hundred twenty-four thousand, nine hundred twenty-one".