1273203640 has 32 divisors (see below), whose sum is σ = 2989262880. Its totient is φ = 487138432.

The previous prime is 1273203637. The next prime is 1273203643. The reversal of 1273203640 is 463023721.

It is an interprime number because it is at equal distance from previous prime (1273203637) and next prime (1273203643).

It is a junction number, because it is equal to n+sod(n) for n = 1273203599 and 1273203608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1273203643) 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 7 ways as a sum of consecutive naturals, for example, 691039 + ... + 692878.

It is an arithmetic number, because the mean of its divisors is an integer number (93414465).

Almost surely, 2^1273203640 is an apocalyptic number.

1273203640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1273203640 is an abundant number, since it is smaller than the sum of its proper divisors (1716059240).

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

1273203640 is a wasteful number, since it uses less digits than its factorization.

1273203640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1383951 (or 1383947 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 1273203640 is about 35681.9792051954. The cubic root of 1273203640 is about 1083.8419521486.

The spelling of 1273203640 in words is "one billion, two hundred seventy-three million, two hundred three thousand, six hundred forty".