979917947 has 4 divisors (see below), whose sum is σ = 994543656. Its totient is φ = 965292240.

The previous prime is 979917943. The next prime is 979917977. The reversal of 979917947 is 749719979.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 749719979 = 223 ⋅3361973.

It is a cyclic number.

It is not a de Polignac number, because 979917947 - 2² = 979917943 is a prime.

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 979917947.

It is not an unprimeable number, because it can be changed into a prime (979917943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7312754 + ... + 7312887.

It is an arithmetic number, because the mean of its divisors is an integer number (248635914).

Almost surely, 2^979917947 is an apocalyptic number.

979917947 is the 16733-rd centered heptagonal number.

979917947 is a deficient number, since it is larger than the sum of its proper divisors (14625709).

979917947 is a wasteful number, since it uses less digits than its factorization.

979917947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14625708.

The product of its digits is 9001692, while the sum is 62.

The square root of 979917947 is about 31303.6411140941. The cubic root of 979917947 is about 993.2606657375.

The spelling of 979917947 in words is "nine hundred seventy-nine million, nine hundred seventeen thousand, nine hundred forty-seven".