12705438 has 8 divisors (see below), whose sum is σ = 25410888. Its totient is φ = 4235144.

The previous prime is 12705437. The next prime is 12705481. The reversal of 12705438 is 83450721.

It is a sphenic number, since it is the product of 3 distinct primes.

12705438 is an admirable number.

It is a super-2 number, since 2×12705438² = 322856309543688, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12705437) 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, 1058781 + ... + 1058792.

It is an arithmetic number, because the mean of its divisors is an integer number (3176361).

Almost surely, 2^12705438 is an apocalyptic number.

12705438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

12705438 is a wasteful number, since it uses less digits than its factorization.

12705438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2117578.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 12705438 is about 3564.4688243832. The cubic root of 12705438 is about 233.3439509908.

The spelling of 12705438 in words is "twelve million, seven hundred five thousand, four hundred thirty-eight".