1263120 has 80 divisors (see below), whose sum is σ = 4136640. Its totient is φ = 317952.

The previous prime is 1263113. The next prime is 1263121. The reversal of 1263120 is 213621.

1263120 = 65² + 66² + ... + 159².

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1263120.

It is not an unprimeable number, because it can be changed into a prime (1263121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4422 + ... + 4698.

It is an arithmetic number, because the mean of its divisors is an integer number (51708).

2^1263120 is an apocalyptic number.

1263120 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 1263120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2068320).

1263120 is an abundant number, since it is smaller than the sum of its proper divisors (2873520).

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

1263120 is a wasteful number, since it uses less digits than its factorization.

1263120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1263120 is about 1123.8861152270. The cubic root of 1263120 is about 108.0973059928.

Adding to 1263120 its reverse (213621), we get a palindrome (1476741).

The spelling of 1263120 in words is "one million, two hundred sixty-three thousand, one hundred twenty".