12157871 has 4 divisors (see below), whose sum is σ = 13263144. Its totient is φ = 11052600.

The previous prime is 12157861. The next prime is 12157877. The reversal of 12157871 is 17875121.

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

It is a cyclic number.

It is not a de Polignac number, because 12157871 - 2¹⁰ = 12156847 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 (12157877) 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, 552620 + ... + 552641.

It is an arithmetic number, because the mean of its divisors is an integer number (3315786).

Almost surely, 2^12157871 is an apocalyptic number.

12157871 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12157871 is a deficient number, since it is larger than the sum of its proper divisors (1105273).

12157871 is a wasteful number, since it uses less digits than its factorization.

12157871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105272.

The product of its digits is 3920, while the sum is 32.

The square root of 12157871 is about 3486.8138751588. The cubic root of 12157871 is about 229.9424619777.

The spelling of 12157871 in words is "twelve million, one hundred fifty-seven thousand, eight hundred seventy-one".