1252454423440 has 40 divisors (see below), whose sum is σ = 3176679858048. Its totient is φ = 455437971840.

The previous prime is 1252454423413. The next prime is 1252454423453. The reversal of 1252454423440 is 443244542521.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1252454423393 and 1252454423402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 711620952 + ... + 711622711.

Almost surely, 2^{1252454423440} is an apocalyptic number.

1252454423440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1252454423440 is an abundant number, since it is smaller than the sum of its proper divisors (1924225434608).

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

1252454423440 is a wasteful number, since it uses less digits than its factorization.

1252454423440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423243687 (or 1423243681 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 40.

Adding to 1252454423440 its reverse (443244542521), we get a palindrome (1695698965961).

The spelling of 1252454423440 in words is "one trillion, two hundred fifty-two billion, four hundred fifty-four million, four hundred twenty-three thousand, four hundred forty".