1273485440 has 64 divisors (see below), whose sum is σ = 3048788160. Its totient is φ = 508664832.

The previous prime is 1273485407. The next prime is 1273485457. The reversal of 1273485440 is 445843721.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 1273485394 and 1273485403.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 781907 + ... + 783533.

It is an arithmetic number, because the mean of its divisors is an integer number (47637315).

Almost surely, 2^1273485440 is an apocalyptic number.

1273485440 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 1273485440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1524394080).

1273485440 is an abundant number, since it is smaller than the sum of its proper divisors (1775302720).

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

1273485440 is a wasteful number, since it uses less digits than its factorization.

1273485440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2869 (or 2857 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 38.

The square root of 1273485440 is about 35685.9277587118. The cubic root of 1273485440 is about 1083.9219090180.

The spelling of 1273485440 in words is "one billion, two hundred seventy-three million, four hundred eighty-five thousand, four hundred forty".