1158820 has 24 divisors (see below), whose sum is σ = 2621304. Its totient is φ = 427776.

The previous prime is 1158799. The next prime is 1158821. The reversal of 1158820 is 288511.

It can be written as a sum of positive squares in 4 ways, for example, as 60516 + 1098304 = 246^2 + 1048^2 .

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (1158821) 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, 1969 + ... + 2488.

It is an arithmetic number, because the mean of its divisors is an integer number (109221).

2^1158820 is an apocalyptic number.

1158820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1158820 is an abundant number, since it is smaller than the sum of its proper divisors (1462484).

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

1158820 is a wasteful number, since it uses less digits than its factorization.

1158820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4479 (or 4477 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 1158820 is about 1076.4850207969. The cubic root of 1158820 is about 105.0361175825.

The spelling of 1158820 in words is "one million, one hundred fifty-eight thousand, eight hundred twenty".