2406981721 has 9 divisors (see below), whose sum is σ = 2444898549. Its totient is φ = 2369646300.

The previous prime is 2406981713. The next prime is 2406981743. The reversal of 2406981721 is 1271896042.

The square root of 2406981721 is 49061.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 2406981721 - 2³ = 2406981713 is a prime.

It is a super-2 number, since 2×2406981721² = 11587122010456243682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2406981781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3482986 + ... + 3483676.

Almost surely, 2^2406981721 is an apocalyptic number.

2406981721 is the 49061-st square number.

2406981721 is the 24531-st centered octagonal number.

It is an amenable number.

2406981721 is a deficient number, since it is larger than the sum of its proper divisors (37916828).

2406981721 is an frugal number, since it uses more digits than its factorization.

2406981721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524 (or 762 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The cubic root of 2406981721 is about 1340.1629194130.

The spelling of 2406981721 in words is "two billion, four hundred six million, nine hundred eighty-one thousand, seven hundred twenty-one".