1288157 has 4 divisors (see below), whose sum is σ = 1387260. Its totient is φ = 1189056.

The previous prime is 1288117. The next prime is 1288163. The reversal of 1288157 is 7518821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 630436 + 657721 = 794^2 + 811^2 .

It is a cyclic number.

It is not a de Polignac number, because 1288157 - 2¹⁰ = 1287133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288117) 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, 49532 + ... + 49557.

It is an arithmetic number, because the mean of its divisors is an integer number (346815).

2^1288157 is an apocalyptic number.

It is an amenable number.

1288157 is a deficient number, since it is larger than the sum of its proper divisors (99103).

1288157 is an equidigital number, since it uses as much as digits as its factorization.

1288157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99102.

The product of its digits is 4480, while the sum is 32.

The square root of 1288157 is about 1134.9700436575. The cubic root of 1288157 is about 108.8068571316.

The spelling of 1288157 in words is "one million, two hundred eighty-eight thousand, one hundred fifty-seven".