2721397 has 8 divisors (see below), whose sum is σ = 3210752. Its totient is φ = 2257200.

The previous prime is 2721371. The next prime is 2721401. The reversal of 2721397 is 7931272.

2721397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 2721397 - 2¹¹ = 2719349 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

2721397 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2721307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6054 + ... + 6487.

It is an arithmetic number, because the mean of its divisors is an integer number (401344).

2^2721397 is an apocalyptic number.

It is an amenable number.

2721397 is a deficient number, since it is larger than the sum of its proper divisors (489355).

2721397 is a wasteful number, since it uses less digits than its factorization.

2721397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12579.

The product of its digits is 5292, while the sum is 31.

The square root of 2721397 is about 1649.6657237150. The cubic root of 2721397 is about 139.6145349026.

The spelling of 2721397 in words is "two million, seven hundred twenty-one thousand, three hundred ninety-seven".