2551240 has 16 divisors (see below), whose sum is σ = 5740380. Its totient is φ = 1020480.

The previous prime is 2551223. The next prime is 2551247. The reversal of 2551240 is 421552.

It can be written as a sum of positive squares in 2 ways, for example, as 2540836 + 10404 = 1594^2 + 102^2 .

It is not an unprimeable number, because it can be changed into a prime (2551247) 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, 31851 + ... + 31930.

2^2551240 is an apocalyptic number.

2551240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2551240 is an abundant number, since it is smaller than the sum of its proper divisors (3189140).

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

2551240 is a wasteful number, since it uses less digits than its factorization.

2551240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63792 (or 63788 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 2551240 is about 1597.2601541390. The cubic root of 2551240 is about 136.6418621121.

Adding to 2551240 its reverse (421552), we get a palindrome (2972792).

It can be divided in two parts, 25512 and 40, that added together give a palindrome (25552).

The spelling of 2551240 in words is "two million, five hundred fifty-one thousand, two hundred forty".