7745981 has 4 divisors (see below), whose sum is σ = 7778364. Its totient is φ = 7713600.

The previous prime is 7745971. The next prime is 7745989. The reversal of 7745981 is 1895477.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1895477 = 97 ⋅19541.

It can be written as a sum of positive squares in 2 ways, for example, as 6996025 + 749956 = 2645^2 + 866^2 .

It is a cyclic number.

It is not a de Polignac number, because 7745981 - 2¹⁸ = 7483837 is a prime.

It is a super-2 number, since 2×7745981² = 120000443304722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7745989) 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, 15830 + ... + 16311.

It is an arithmetic number, because the mean of its divisors is an integer number (1944591).

Almost surely, 2^7745981 is an apocalyptic number.

It is an amenable number.

7745981 is a deficient number, since it is larger than the sum of its proper divisors (32383).

7745981 is a wasteful number, since it uses less digits than its factorization.

7745981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32382.

The product of its digits is 70560, while the sum is 41.

The square root of 7745981 is about 2783.1602540996. The cubic root of 7745981 is about 197.8603664694.

The spelling of 7745981 in words is "seven million, seven hundred forty-five thousand, nine hundred eighty-one".