12705538 has 16 divisors (see below), whose sum is σ = 19800000. Its totient is φ = 6107472.

The previous prime is 12705523. The next prime is 12705569. The reversal of 12705538 is 83550721.

It is a super-2 number, since 2×12705538² = 322861391738888, which contains 22 as substring.

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 in 7 ways as a sum of consecutive naturals, for example, 25213 + ... + 25711.

It is an arithmetic number, because the mean of its divisors is an integer number (1237500).

Almost surely, 2^12705538 is an apocalyptic number.

12705538 is a deficient number, since it is larger than the sum of its proper divisors (7094462).

12705538 is a wasteful number, since it uses less digits than its factorization.

12705538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 12705538 is about 3564.4828516911. The cubic root of 12705538 is about 233.3445631783.

The spelling of 12705538 in words is "twelve million, seven hundred five thousand, five hundred thirty-eight".