7981385 has 4 divisors (see below), whose sum is σ = 9577668. Its totient is φ = 6385104.

The previous prime is 7981339. The next prime is 7981397. The reversal of 7981385 is 5831897.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5831897 = 73 ⋅79889.

It can be written as a sum of positive squares in 2 ways, for example, as 2274064 + 5707321 = 1508^2 + 2389^2 .

It is a cyclic number.

It is not a de Polignac number, because 7981385 - 2⁶ = 7981321 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 798134 + ... + 798143.

It is an arithmetic number, because the mean of its divisors is an integer number (2394417).

Almost surely, 2^7981385 is an apocalyptic number.

It is an amenable number.

7981385 is a deficient number, since it is larger than the sum of its proper divisors (1596283).

7981385 is a wasteful number, since it uses less digits than its factorization.

7981385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1596282.

The product of its digits is 60480, while the sum is 41.

The square root of 7981385 is about 2825.1345100720. The cubic root of 7981385 is about 199.8447545254.

The spelling of 7981385 in words is "seven million, nine hundred eighty-one thousand, three hundred eighty-five".