12640574 has 4 divisors (see below), whose sum is σ = 18960864. Its totient is φ = 6320286.

The previous prime is 12640561. The next prime is 12640601. The reversal of 12640574 is 47504621.

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

It is a super-2 number, since 2×12640574² = 319568222098952, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3160142 + ... + 3160145.

It is an arithmetic number, because the mean of its divisors is an integer number (4740216).

Almost surely, 2^12640574 is an apocalyptic number.

12640574 is a deficient number, since it is larger than the sum of its proper divisors (6320290).

12640574 is an equidigital number, since it uses as much as digits as its factorization.

12640574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6320289.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 12640574 is about 3555.3584910667. The cubic root of 12640574 is about 232.9461829324.

The spelling of 12640574 in words is "twelve million, six hundred forty thousand, five hundred seventy-four".