1187446979 has 2 divisors, whose sum is σ = 1187446980. Its totient is φ = 1187446978.

The previous prime is 1187446973. The next prime is 1187447069. The reversal of 1187446979 is 9796447811.

It is a weak prime.

It is an emirp because it is prime and its reverse (9796447811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1187446979 - 2²⁰ = 1186398403 is a prime.

It is not a weakly prime, because it can be changed into another prime (1187446973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593723489 + 593723490.

It is an arithmetic number, because the mean of its divisors is an integer number (593723490).

Almost surely, 2^1187446979 is an apocalyptic number.

1187446979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187446979 is an equidigital number, since it uses as much as digits as its factorization.

1187446979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 56.

The square root of 1187446979 is about 34459.3525621129. The cubic root of 1187446979 is about 1058.9401352957.

The spelling of 1187446979 in words is "one billion, one hundred eighty-seven million, four hundred forty-six thousand, nine hundred seventy-nine".