2561420 has 24 divisors (see below), whose sum is σ = 5443200. Its totient is φ = 1012352.

The previous prime is 2561411. The next prime is 2561423. The reversal of 2561420 is 241652.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2561392 and 2561401.

It is not an unprimeable number, because it can be changed into a prime (2561423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1061 + ... + 2499.

It is an arithmetic number, because the mean of its divisors is an integer number (226800).

2^2561420 is an apocalyptic number.

2561420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2561420 is an abundant number, since it is smaller than the sum of its proper divisors (2881780).

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

2561420 is a wasteful number, since it uses less digits than its factorization.

2561420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1537 (or 1535 counting only the distinct ones).

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

The square root of 2561420 is about 1600.4436884814. The cubic root of 2561420 is about 136.8233644531.

The spelling of 2561420 in words is "two million, five hundred sixty-one thousand, four hundred twenty".