12840157 has 10 divisors (see below), whose sum is σ = 14140190. Its totient is φ = 11659560.

The previous prime is 12840133. The next prime is 12840193. The reversal of 12840157 is 75104821.

It can be written as a sum of positive squares in only one way, i.e., 12313081 + 527076 = 3509^2 + 726^2 .

It is not a de Polignac number, because 12840157 - 2¹¹ = 12838109 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 (12870157) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 14203 + ... + 15079.

It is an arithmetic number, because the mean of its divisors is an integer number (1414019).

Almost surely, 2^12840157 is an apocalyptic number.

It is an amenable number.

12840157 is a deficient number, since it is larger than the sum of its proper divisors (1300033).

12840157 is an frugal number, since it uses more digits than its factorization.

12840157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921 (or 888 counting only the distinct ones).

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

The square root of 12840157 is about 3583.3164805805. The cubic root of 12840157 is about 234.1657882269.

Adding to 12840157 its reverse (75104821), we get a palindrome (87944978).

The spelling of 12840157 in words is "twelve million, eight hundred forty thousand, one hundred fifty-seven".