2451220 has 12 divisors (see below), whose sum is σ = 5147604. Its totient is φ = 980480.

The previous prime is 2451203. The next prime is 2451221. The reversal of 2451220 is 221542.

It can be written as a sum of positive squares in 2 ways, for example, as 1552516 + 898704 = 1246^2 + 948^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2451194 and 2451203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2451221) 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, 61261 + ... + 61300.

It is an arithmetic number, because the mean of its divisors is an integer number (428967).

2^2451220 is an apocalyptic number.

2451220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2451220 is an abundant number, since it is smaller than the sum of its proper divisors (2696384).

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

2451220 is a wasteful number, since it uses less digits than its factorization.

2451220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122570 (or 122568 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 2451220 is about 1565.6372504511. The cubic root of 2451220 is about 134.8323478973.

Adding to 2451220 its reverse (221542), we get a palindrome (2672762).

The spelling of 2451220 in words is "two million, four hundred fifty-one thousand, two hundred twenty".