1245920 has 48 divisors (see below), whose sum is σ = 3175200. Its totient is φ = 459264.

The previous prime is 1245917. The next prime is 1245929. The reversal of 1245920 is 295421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245929) 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 7 ways as a sum of consecutive naturals, for example, 1781 + ... + 2379.

It is an arithmetic number, because the mean of its divisors is an integer number (66150).

2^1245920 is an apocalyptic number.

1245920 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 1245920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1587600).

1245920 is an abundant number, since it is smaller than the sum of its proper divisors (1929280).

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

1245920 is a wasteful number, since it uses less digits than its factorization.

1245920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627 (or 619 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1245920 is about 1116.2078659461. The cubic root of 1245920 is about 107.6044055078.

The spelling of 1245920 in words is "one million, two hundred forty-five thousand, nine hundred twenty".