2451720 has 32 divisors (see below), whose sum is σ = 7355520. Its totient is φ = 653760.

The previous prime is 2451719. The next prime is 2451721. The reversal of 2451720 is 271542.

It is an interprime number because it is at equal distance from previous prime (2451719) and next prime (2451721).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2451721) 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, 10096 + ... + 10335.

It is an arithmetic number, because the mean of its divisors is an integer number (229860).

2^2451720 is an apocalyptic number.

2451720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2451720 is an abundant number, since it is smaller than the sum of its proper divisors (4903800).

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

2451720 is a wasteful number, since it uses less digits than its factorization.

2451720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20445 (or 20441 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 2451720 is about 1565.7969216983. The cubic root of 2451720 is about 134.8415149775.

The spelling of 2451720 in words is "two million, four hundred fifty-one thousand, seven hundred twenty".