1273513840 has 40 divisors (see below), whose sum is σ = 2964654000. Its totient is φ = 508763136.

The previous prime is 1273513819. The next prime is 1273513847. The reversal of 1273513840 is 483153721.

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

It is a junction number, because it is equal to n+sod(n) for n = 1273513796 and 1273513805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1273513847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56536 + ... + 75784.

It is an arithmetic number, because the mean of its divisors is an integer number (74116350).

Almost surely, 2^1273513840 is an apocalyptic number.

1273513840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1273513840 is an abundant number, since it is smaller than the sum of its proper divisors (1691140160).

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

1273513840 is a wasteful number, since it uses less digits than its factorization.

1273513840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20089 (or 20083 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 1273513840 is about 35686.3256724477. The cubic root of 1273513840 is about 1083.9299664726.

The spelling of 1273513840 in words is "one billion, two hundred seventy-three million, five hundred thirteen thousand, eight hundred forty".