2721897 has 8 divisors (see below), whose sum is σ = 4032480. Its totient is φ = 1814580.

The previous prime is 2721877. The next prime is 2721899. The reversal of 2721897 is 7981272.

It is not a de Polignac number, because 2721897 - 2¹⁵ = 2689129 is a prime.

2721897 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2721899) 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, 50379 + ... + 50432.

It is an arithmetic number, because the mean of its divisors is an integer number (504060).

2^2721897 is an apocalyptic number.

2721897 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2721897 is a deficient number, since it is larger than the sum of its proper divisors (1310583).

2721897 is a wasteful number, since it uses less digits than its factorization.

2721897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100820 (or 100814 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 2721897 is about 1649.8172626082. The cubic root of 2721897 is about 139.6230847996.

The spelling of 2721897 in words is "two million, seven hundred twenty-one thousand, eight hundred ninety-seven".