979681393 has 4 divisors (see below), whose sum is σ = 1013463540. Its totient is φ = 945899248.

The previous prime is 979681369. The next prime is 979681397. The reversal of 979681393 is 393186979.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 393186979 = 73 ⋅5386123.

It can be written as a sum of positive squares in 2 ways, for example, as 821223649 + 158457744 = 28657^2 + 12588^2 .

It is a cyclic number.

It is not a de Polignac number, because 979681393 - 2²¹ = 977584241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (979681397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16891030 + ... + 16891087.

It is an arithmetic number, because the mean of its divisors is an integer number (253365885).

Almost surely, 2^979681393 is an apocalyptic number.

It is an amenable number.

979681393 is a deficient number, since it is larger than the sum of its proper divisors (33782147).

979681393 is a wasteful number, since it uses less digits than its factorization.

979681393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33782146.

The product of its digits is 2204496, while the sum is 55.

The square root of 979681393 is about 31299.8625076852. The cubic root of 979681393 is about 993.1807343196.

The spelling of 979681393 in words is "nine hundred seventy-nine million, six hundred eighty-one thousand, three hundred ninety-three".