1253404125440 has 36 divisors (see below), whose sum is σ = 3002294572284. Its totient is φ = 501361649664.

The previous prime is 1253404125377. The next prime is 1253404125517. The reversal of 1253404125440 is 445214043521.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 680875823104 + 572528302336 = 825152^2 + 756656^2 .

It is a super-2 number, since 2×1253404125440² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1253404125440.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 489609707 + ... + 489612266.

Almost surely, 2^{1253404125440} is an apocalyptic number.

1253404125440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1253404125440 is an abundant number, since it is smaller than the sum of its proper divisors (1748890446844).

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

1253404125440 is an frugal number, since it uses more digits than its factorization.

1253404125440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979221994 (or 979221980 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 35.

Adding to 1253404125440 its reverse (445214043521), we get a palindrome (1698618168961).

The spelling of 1253404125440 in words is "one trillion, two hundred fifty-three billion, four hundred four million, one hundred twenty-five thousand, four hundred forty".