12561842 has 8 divisors (see below), whose sum is σ = 18859932. Its totient is φ = 6275200.

The previous prime is 12561823. The next prime is 12561859. The reversal of 12561842 is 24816521.

It can be written as a sum of positive squares in 2 ways, for example, as 11498881 + 1062961 = 3391^2 + 1031^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 842 + ... + 5082.

Almost surely, 2^12561842 is an apocalyptic number.

12561842 is a deficient number, since it is larger than the sum of its proper divisors (6298090).

12561842 is a wasteful number, since it uses less digits than its factorization.

12561842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5724.

The product of its digits is 3840, while the sum is 29.

The square root of 12561842 is about 3544.2688949909. The cubic root of 12561842 is about 232.4615390961.

The spelling of 12561842 in words is "twelve million, five hundred sixty-one thousand, eight hundred forty-two".