1252445440 has 36 divisors (see below), whose sum is σ = 3000001284. Its totient is φ = 500977664.

The previous prime is 1252445423. The next prime is 1252445443. The reversal of 1252445440 is 445442521.

It can be written as a sum of positive squares in 2 ways, for example, as 417466624 + 834978816 = 20432^2 + 28896^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252445443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487957 + ... + 490516.

It is an arithmetic number, because the mean of its divisors is an integer number (83333369).

Almost surely, 2^1252445440 is an apocalyptic number.

1252445440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1252445440 is an abundant number, since it is smaller than the sum of its proper divisors (1747555844).

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

1252445440 is an frugal number, since it uses more digits than its factorization.

1252445440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978494 (or 978480 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 31.

The square root of 1252445440 is about 35389.9059054980. The cubic root of 1252445440 is about 1077.9193595214.

Adding to 1252445440 its reverse (445442521), we get a palindrome (1697887961).

The spelling of 1252445440 in words is "one billion, two hundred fifty-two million, four hundred forty-five thousand, four hundred forty".