1155257 has 8 divisors (see below), whose sum is σ = 1246560. Its totient is φ = 1067040.

The previous prime is 1155247. The next prime is 1155263. The reversal of 1155257 is 7525511.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1155257 - 2⁸ = 1155001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155247) 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, 38 + ... + 1520.

It is an arithmetic number, because the mean of its divisors is an integer number (155820).

2^1155257 is an apocalyptic number.

It is an amenable number.

1155257 is a deficient number, since it is larger than the sum of its proper divisors (91303).

1155257 is a wasteful number, since it uses less digits than its factorization.

1155257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1543.

The product of its digits is 1750, while the sum is 26.

The square root of 1155257 is about 1074.8288235808. The cubic root of 1155257 is about 104.9283562669.

It can be divided in two parts, 1155 and 257, that multiplied together give a triangular number (296835 = T₇₇₀).

The spelling of 1155257 in words is "one million, one hundred fifty-five thousand, two hundred fifty-seven".