7309981 has 4 divisors (see below), whose sum is σ = 8354272. Its totient is φ = 6265692.

The previous prime is 7309933. The next prime is 7309987. The reversal of 7309981 is 1899037.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7309981 - 2¹⁷ = 7178909 is a prime.

It is a super-2 number, since 2×7309981² = 106871644440722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7309981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7309987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 522135 + ... + 522148.

It is an arithmetic number, because the mean of its divisors is an integer number (2088568).

Almost surely, 2^7309981 is an apocalyptic number.

It is an amenable number.

7309981 is a deficient number, since it is larger than the sum of its proper divisors (1044291).

7309981 is a wasteful number, since it uses less digits than its factorization.

7309981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044290.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 7309981 is about 2703.6976532149. The cubic root of 7309981 is about 194.0761117727.

The spelling of 7309981 in words is "seven million, three hundred nine thousand, nine hundred eighty-one".