12640542 has 16 divisors (see below), whose sum is σ = 25696272. Its totient is φ = 4144320.

The previous prime is 12640531. The next prime is 12640543. The reversal of 12640542 is 24504621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16903 + ... + 17634.

It is an arithmetic number, because the mean of its divisors is an integer number (1606017).

Almost surely, 2^12640542 is an apocalyptic number.

12640542 is an abundant number, since it is smaller than the sum of its proper divisors (13055730).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12640542 is a wasteful number, since it uses less digits than its factorization.

12640542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34603.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 12640542 is about 3555.3539908144. The cubic root of 12640542 is about 232.9459863621.

The spelling of 12640542 in words is "twelve million, six hundred forty thousand, five hundred forty-two".