2072721 has 16 divisors (see below), whose sum is σ = 3196800. Its totient is φ = 1170048.

The previous prime is 2072701. The next prime is 2072731. The reversal of 2072721 is 1272702.

It is not a de Polignac number, because 2072721 - 2⁹ = 2072209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (2072701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1315 + ... + 2423.

It is an arithmetic number, because the mean of its divisors is an integer number (199800).

2^2072721 is an apocalyptic number.

2072721 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2072721 is a deficient number, since it is larger than the sum of its proper divisors (1124079).

2072721 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 8 representation: 2072721 = (7720221)₈.

2072721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1208.

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 2072721 is about 1439.6947593153. The cubic root of 2072721 is about 127.5010072969.

The spelling of 2072721 in words is "two million, seventy-two thousand, seven hundred twenty-one".