1147979 has 4 divisors (see below), whose sum is σ = 1311984. Its totient is φ = 983976.

The previous prime is 1147969. The next prime is 1147981. The reversal of 1147979 is 9797411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9797411 = 13 ⋅753647.

It is not a de Polignac number, because 1147979 - 2¹⁶ = 1082443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1147969) 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, 81992 + ... + 82005.

It is an arithmetic number, because the mean of its divisors is an integer number (327996).

2^1147979 is an apocalyptic number.

1147979 is a deficient number, since it is larger than the sum of its proper divisors (164005).

1147979 is an equidigital number, since it uses as much as digits as its factorization.

1147979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164004.

The product of its digits is 15876, while the sum is 38.

The square root of 1147979 is about 1071.4378190077. The cubic root of 1147979 is about 104.7075459793.

The spelling of 1147979 in words is "one million, one hundred forty-seven thousand, nine hundred seventy-nine".