1245543040 has 128 divisors (see below), whose sum is σ = 3520713600. Its totient is φ = 412274688.

The previous prime is 1245543007. The next prime is 1245543049. The reversal of 1245543040 is 403455421.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (1245543049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125127 + ... + 134713.

It is an arithmetic number, because the mean of its divisors is an integer number (27505575).

Almost surely, 2^1245543040 is an apocalyptic number.

1245543040 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 1245543040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1760356800).

1245543040 is an abundant number, since it is smaller than the sum of its proper divisors (2275170560).

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

1245543040 is an equidigital number, since it uses as much as digits as its factorization.

1245543040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9642 (or 9630 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 1245543040 is about 35292.2518408786. The cubic root of 1245543040 is about 1075.9355231008.

Adding to 1245543040 its reverse (403455421), we get a palindrome (1648998461).

The spelling of 1245543040 in words is "one billion, two hundred forty-five million, five hundred forty-three thousand, forty".