1155860 has 12 divisors (see below), whose sum is σ = 2427348. Its totient is φ = 462336.

The previous prime is 1155859. The next prime is 1155863. The reversal of 1155860 is 685511.

It can be written as a sum of positive squares in 2 ways, for example, as 643204 + 512656 = 802^2 + 716^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28877 + ... + 28916.

It is an arithmetic number, because the mean of its divisors is an integer number (202279).

2^1155860 is an apocalyptic number.

1155860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155860 is an abundant number, since it is smaller than the sum of its proper divisors (1271488).

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

1155860 is a wasteful number, since it uses less digits than its factorization.

1155860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57802 (or 57800 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 1155860 is about 1075.1092967694. The cubic root of 1155860 is about 104.9466092887.

The spelling of 1155860 in words is "one million, one hundred fifty-five thousand, eight hundred sixty".