1273681920 has 192 divisors, whose sum is σ = 4657685760. Its totient is φ = 291078144.

The previous prime is 1273681919. The next prime is 1273681921. The reversal of 1273681920 is 291863721.

It is an interprime number because it is at equal distance from previous prime (1273681919) and next prime (1273681921).

It is a tau number, because it is divible by the number of its divisors (192).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1273681921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212079 + ... + 218001.

It is an arithmetic number, because the mean of its divisors is an integer number (24258780).

Almost surely, 2^1273681920 is an apocalyptic number.

1273681920 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 1273681920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2328842880).

1273681920 is an abundant number, since it is smaller than the sum of its proper divisors (3384003840).

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

1273681920 is an equidigital number, since it uses as much as digits as its factorization.

1273681920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5960 (or 5940 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 1273681920 is about 35688.6805584068. The cubic root of 1273681920 is about 1083.9776505334.

The spelling of 1273681920 in words is "one billion, two hundred seventy-three million, six hundred eighty-one thousand, nine hundred twenty".