2721836 has 24 divisors (see below), whose sum is σ = 5433120. Its totient is φ = 1181952.

The previous prime is 2721827. The next prime is 2721841. The reversal of 2721836 is 6381272.

It is a happy number.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 2721799 and 2721808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 656 + ... + 2423.

It is an arithmetic number, because the mean of its divisors is an integer number (226380).

2^2721836 is an apocalyptic number.

2721836 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2721836 is a deficient number, since it is larger than the sum of its proper divisors (2711284).

2721836 is a wasteful number, since it uses less digits than its factorization.

2721836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3113 (or 3111 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 2721836 is about 1649.7987756087. The cubic root of 2721836 is about 139.6220417683.

The spelling of 2721836 in words is "two million, seven hundred twenty-one thousand, eight hundred thirty-six".