2451440 has 20 divisors (see below), whose sum is σ = 5699784. Its totient is φ = 980544.

The previous prime is 2451433. The next prime is 2451443. The reversal of 2451440 is 441542.

It is a tau number, because it is divible by the number of its divisors (20).

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 (2451443) 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, 15242 + ... + 15401.

2^2451440 is an apocalyptic number.

2451440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2451440 is an abundant number, since it is smaller than the sum of its proper divisors (3248344).

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

2451440 is a wasteful number, since it uses less digits than its factorization.

2451440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30656 (or 30650 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 2451440 is about 1565.7075078060. The cubic root of 2451440 is about 134.8363815661.

Adding to 2451440 its reverse (441542), we get a palindrome (2892982).

The spelling of 2451440 in words is "two million, four hundred fifty-one thousand, four hundred forty".