2403540 has 48 divisors (see below), whose sum is σ = 7479360. Its totient is φ = 640800.

The previous prime is 2403521. The next prime is 2403547. The reversal of 2403540 is 453042.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2403547) 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, 1686 + ... + 2765.

It is an arithmetic number, because the mean of its divisors is an integer number (155820).

2^2403540 is an apocalyptic number.

2403540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2403540 is an abundant number, since it is smaller than the sum of its proper divisors (5075820).

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

2403540 is a wasteful number, since it uses less digits than its factorization.

2403540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4469 (or 4461 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 2403540 is about 1550.3354475726. The cubic root of 2403540 is about 133.9523852511.

Adding to 2403540 its reverse (453042), we get a palindrome (2856582).

The spelling of 2403540 in words is "two million, four hundred three thousand, five hundred forty".