1273820120 has 32 divisors (see below), whose sum is σ = 2875165200. Its totient is φ = 507915648.

The previous prime is 1273820113. The next prime is 1273820123. The reversal of 1273820120 is 210283721.

It is a self number, because there is not a number n which added to its sum of digits gives 1273820120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1273820123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37550 + ... + 62909.

Almost surely, 2^1273820120 is an apocalyptic number.

1273820120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1273820120 is an abundant number, since it is smaller than the sum of its proper divisors (1601345080).

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

1273820120 is a wasteful number, since it uses less digits than its factorization.

1273820120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100787 (or 100783 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 1273820120 is about 35690.6166940276. The cubic root of 1273820120 is about 1084.0168545375.

The spelling of 1273820120 in words is "one billion, two hundred seventy-three million, eight hundred twenty thousand, one hundred twenty".