1156980 has 48 divisors (see below), whose sum is σ = 3536064. Its totient is φ = 280320.

The previous prime is 1156963. The next prime is 1156997. The reversal of 1156980 is 896511.

1156980 = T₁₇₇ + T₁₇₈ + ... + T₂₃₁.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1156963) and next prime (1156997).

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217 + ... + 1536.

It is an arithmetic number, because the mean of its divisors is an integer number (73668).

2^1156980 is an apocalyptic number.

1156980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1156980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1768032).

1156980 is an abundant number, since it is smaller than the sum of its proper divisors (2379084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1156980 is a wasteful number, since it uses less digits than its factorization.

1156980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1776 (or 1774 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 1156980 is about 1075.6300479254. The cubic root of 1156980 is about 104.9804952432.

The spelling of 1156980 in words is "one million, one hundred fifty-six thousand, nine hundred eighty".