1155857 has 4 divisors (see below), whose sum is σ = 1159536. Its totient is φ = 1152180.

The previous prime is 1155851. The next prime is 1155859. The reversal of 1155857 is 7585511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1155857 - 2⁴ = 1155841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155851) 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, 1319 + ... + 2012.

It is an arithmetic number, because the mean of its divisors is an integer number (289884).

2^1155857 is an apocalyptic number.

It is an amenable number.

1155857 is a deficient number, since it is larger than the sum of its proper divisors (3679).

1155857 is an equidigital number, since it uses as much as digits as its factorization.

1155857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3678.

The product of its digits is 7000, while the sum is 32.

The square root of 1155857 is about 1075.1079015615. The cubic root of 1155857 is about 104.9465184933.

The spelling of 1155857 in words is "one million, one hundred fifty-five thousand, eight hundred fifty-seven".