12840172 has 6 divisors (see below), whose sum is σ = 22470308. Its totient is φ = 6420084.

The previous prime is 12840133. The next prime is 12840193. The reversal of 12840172 is 27104821.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1605018 + ... + 1605025.

Almost surely, 2^12840172 is an apocalyptic number.

It is an amenable number.

12840172 is a deficient number, since it is larger than the sum of its proper divisors (9630136).

12840172 is a wasteful number, since it uses less digits than its factorization.

12840172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3210047 (or 3210045 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 12840172 is about 3583.3185736130. The cubic root of 12840172 is about 234.1658794118.

Adding to 12840172 its reverse (27104821), we get a palindrome (39944993).

The spelling of 12840172 in words is "twelve million, eight hundred forty thousand, one hundred seventy-two".