1273842640 has 160 divisors (see below), whose sum is σ = 3604055040. Its totient is φ = 410167296.

The previous prime is 1273842637. The next prime is 1273842641. The reversal of 1273842640 is 462483721.

It is a self number, because there is not a number n which added to its sum of digits gives 1273842640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1273842641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2751049 + ... + 2751511.

It is an arithmetic number, because the mean of its divisors is an integer number (22525344).

Almost surely, 2^1273842640 is an apocalyptic number.

1273842640 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 1273842640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1802027520).

1273842640 is an abundant number, since it is smaller than the sum of its proper divisors (2330212400).

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

1273842640 is an equidigital number, since it uses as much as digits as its factorization.

1273842640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 1273842640 is about 35690.9321817181. The cubic root of 1273842640 is about 1084.0232426492.

The spelling of 1273842640 in words is "one billion, two hundred seventy-three million, eight hundred forty-two thousand, six hundred forty".