2561742 has 12 divisors (see below), whose sum is σ = 5550480. Its totient is φ = 853908.

The previous prime is 2561737. The next prime is 2561743. The reversal of 2561742 is 2471652.

2561742 is a `hidden beast` number, since 2 + 5 + 617 + 42 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561743) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71142 + ... + 71177.

It is an arithmetic number, because the mean of its divisors is an integer number (462540).

2^2561742 is an apocalyptic number.

2561742 is an abundant number, since it is smaller than the sum of its proper divisors (2988738).

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

2561742 is a wasteful number, since it uses less digits than its factorization.

2561742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142327 (or 142324 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 2561742 is about 1600.5442824240. The cubic root of 2561742 is about 136.8290976373.

The spelling of 2561742 in words is "two million, five hundred sixty-one thousand, seven hundred forty-two".