2721406 has 16 divisors (see below), whose sum is σ = 4328064. Its totient is φ = 1280664.

The previous prime is 2721401. The next prime is 2721413. The reversal of 2721406 is 6041272.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2721401) 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, 2641 + ... + 3523.

It is an arithmetic number, because the mean of its divisors is an integer number (270504).

2^2721406 is an apocalyptic number.

2721406 is a deficient number, since it is larger than the sum of its proper divisors (1606658).

2721406 is a wasteful number, since it uses less digits than its factorization.

2721406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 2721406 is about 1649.6684515381. The cubic root of 2721406 is about 139.6146888100.

Adding to 2721406 its reverse (6041272), we get a palindrome (8762678).

The spelling of 2721406 in words is "two million, seven hundred twenty-one thousand, four hundred six".