1284157 has 4 divisors (see below), whose sum is σ = 1467616. Its totient is φ = 1100700.

The previous prime is 1284131. The next prime is 1284169. The reversal of 1284157 is 7514821.

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 1284157 - 2¹¹ = 1282109 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 (1284187) 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 3 ways as a sum of consecutive naturals, for example, 91719 + ... + 91732.

It is an arithmetic number, because the mean of its divisors is an integer number (366904).

2^1284157 is an apocalyptic number.

It is an amenable number.

1284157 is a deficient number, since it is larger than the sum of its proper divisors (183459).

1284157 is an equidigital number, since it uses as much as digits as its factorization.

1284157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183458.

The product of its digits is 2240, while the sum is 28.

The square root of 1284157 is about 1133.2065125122. The cubic root of 1284157 is about 108.6941175876.

Adding to 1284157 its reverse (7514821), we get a palindrome (8798978).

It can be divided in two parts, 1284 and 157, that added together give a palindrome (1441).

The spelling of 1284157 in words is "one million, two hundred eighty-four thousand, one hundred fifty-seven".