1155979 has 8 divisors (see below), whose sum is σ = 1327680. Its totient is φ = 995400.

The previous prime is 1155977. The next prime is 1155997. The reversal of 1155979 is 9795511.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1155979 - 2¹ = 1155977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2557 + ... + 2974.

It is an arithmetic number, because the mean of its divisors is an integer number (165960).

2^1155979 is an apocalyptic number.

1155979 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1155979 is a deficient number, since it is larger than the sum of its proper divisors (171701).

1155979 is a wasteful number, since it uses less digits than its factorization.

1155979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5561.

The product of its digits is 14175, while the sum is 37.

The square root of 1155979 is about 1075.1646385554. The cubic root of 1155979 is about 104.9502107104.

The spelling of 1155979 in words is "one million, one hundred fifty-five thousand, nine hundred seventy-nine".