2531540 has 48 divisors (see below), whose sum is σ = 5975424. Its totient is φ = 892800.

The previous prime is 2531537. The next prime is 2531549. The reversal of 2531540 is 451352.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2531549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7985 + ... + 8295.

It is an arithmetic number, because the mean of its divisors is an integer number (124488).

2^2531540 is an apocalyptic number.

2531540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2531540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2987712).

2531540 is an abundant number, since it is smaller than the sum of its proper divisors (3443884).

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

2531540 is a wasteful number, since it uses less digits than its factorization.

2531540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368 (or 366 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 2531540 is about 1591.0813932669. The cubic root of 2531540 is about 136.2892488560.

Adding to 2531540 its reverse (451352), we get a palindrome (2982892).

The spelling of 2531540 in words is "two million, five hundred thirty-one thousand, five hundred forty".