1265220 has 120 divisors (see below), whose sum is σ = 4390848. Its totient is φ = 302400.

The previous prime is 1265197. The next prime is 1265233. The reversal of 1265220 is 225621.

Added to its reverse (225621) it gives a square (1490841 = 1221²).

1265220 is a `hidden beast` number, since 12 + 652 + 2 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 1265193 and 1265202.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 17785 + ... + 17855.

2^1265220 is an apocalyptic number.

1265220 is a gapful number since it is divisible by the number (10) 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 1265220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2195424).

1265220 is an abundant number, since it is smaller than the sum of its proper divisors (3125628).

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

1265220 is a wasteful number, since it uses less digits than its factorization.

1265220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103 (or 92 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1265220 is about 1124.8199855977. The cubic root of 1265220 is about 108.1571785456.

Adding to 1265220 its reverse (225621), we get a square (1490841 = 1221²).

It can be divided in two parts, 1265 and 220, that added together give a triangular number (1485 = T₅₄).

The spelling of 1265220 in words is "one million, two hundred sixty-five thousand, two hundred twenty".