7209981 has 12 divisors (see below), whose sum is σ = 10513152. Its totient is φ = 4761096.

The previous prime is 7209947. The next prime is 7210001. The reversal of 7209981 is 1899027.

It is a happy number.

It is not a de Polignac number, because 7209981 - 2¹⁷ = 7078909 is a prime.

It is a super-2 number, since 2×7209981² = 103967652040722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7209781) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2781 + ... + 4706.

It is an arithmetic number, because the mean of its divisors is an integer number (876096).

Almost surely, 2^7209981 is an apocalyptic number.

It is an amenable number.

7209981 is a deficient number, since it is larger than the sum of its proper divisors (3303171).

7209981 is a wasteful number, since it uses less digits than its factorization.

7209981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7600 (or 7597 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 7209981 is about 2685.1407784323. The cubic root of 7209981 is about 193.1870630330.

It can be divided in two parts, 720 and 9981, that added together give a palindrome (10701).

The spelling of 7209981 in words is "seven million, two hundred nine thousand, nine hundred eighty-one".