1156540 has 48 divisors (see below), whose sum is σ = 3032064. Its totient is φ = 360000.

The previous prime is 1156537. The next prime is 1156541. The reversal of 1156540 is 456511.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156541) by changing a digit.

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, 1165 + ... + 1915.

It is an arithmetic number, because the mean of its divisors is an integer number (63168).

2^1156540 is an apocalyptic number.

1156540 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 1156540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1516032).

1156540 is an abundant number, since it is smaller than the sum of its proper divisors (1875524).

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

1156540 is a wasteful number, since it uses less digits than its factorization.

1156540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778 (or 776 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1156540 is about 1075.4254971870. The cubic root of 1156540 is about 104.9671855131.

The spelling of 1156540 in words is "one million, one hundred fifty-six thousand, five hundred forty".