1245640 has 64 divisors (see below), whose sum is σ = 3240000. Its totient is φ = 426240.

The previous prime is 1245623. The next prime is 1245649. The reversal of 1245640 is 465421.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245649) 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, 8286 + ... + 8434.

It is an arithmetic number, because the mean of its divisors is an integer number (50625).

2^1245640 is an apocalyptic number.

1245640 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 1245640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1620000).

1245640 is an abundant number, since it is smaller than the sum of its proper divisors (1994360).

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

1245640 is a wasteful number, since it uses less digits than its factorization.

1245640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190 (or 186 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 1245640 is about 1116.0824342315. The cubic root of 1245640 is about 107.5963441312.

The spelling of 1245640 in words is "one million, two hundred forty-five thousand, six hundred forty".