2721946 has 4 divisors (see below), whose sum is σ = 4082922. Its totient is φ = 1360972.

The previous prime is 2721913. The next prime is 2721947. The reversal of 2721946 is 6491272.

2721946 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1990921 + 731025 = 1411^2 + 855^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2721947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 680485 + ... + 680488.

2^2721946 is an apocalyptic number.

2721946 is a deficient number, since it is larger than the sum of its proper divisors (1360976).

2721946 is a wasteful number, since it uses less digits than its factorization.

2721946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360975.

The product of its digits is 6048, while the sum is 31.

The square root of 2721946 is about 1649.8321126709. The cubic root of 2721946 is about 139.6239226332.

The spelling of 2721946 in words is "two million, seven hundred twenty-one thousand, nine hundred forty-six".