2561402 has 8 divisors (see below), whose sum is σ = 3849012. Its totient is φ = 1278400.

The previous prime is 2561401. The next prime is 2561411. The reversal of 2561402 is 2041652.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2524921 + 36481 = 1589^2 + 191^2 .

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

It is not an unprimeable number, because it can be changed into a prime (2561401) 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, 1202 + ... + 2562.

2^2561402 is an apocalyptic number.

2561402 is a deficient number, since it is larger than the sum of its proper divisors (1287610).

2561402 is a wasteful number, since it uses less digits than its factorization.

2561402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2304.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 2561402 is about 1600.4380650309. The cubic root of 2561402 is about 136.8230439504.

The spelling of 2561402 in words is "two million, five hundred sixty-one thousand, four hundred two".