1272985982 has 4 divisors (see below), whose sum is σ = 1909478976. Its totient is φ = 636492990.

The previous prime is 1272985981. The next prime is 1272986009. The reversal of 1272985982 is 2895892721.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272985981) 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 as a sum of consecutive naturals, namely, 318246494 + ... + 318246497.

It is an arithmetic number, because the mean of its divisors is an integer number (477369744).

Almost surely, 2^1272985982 is an apocalyptic number.

1272985982 is a deficient number, since it is larger than the sum of its proper divisors (636492994).

1272985982 is an equidigital number, since it uses as much as digits as its factorization.

1272985982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636492993.

The product of its digits is 1451520, while the sum is 53.

The square root of 1272985982 is about 35678.9291038843. The cubic root of 1272985982 is about 1083.7801866126.

The spelling of 1272985982 in words is "one billion, two hundred seventy-two million, nine hundred eighty-five thousand, nine hundred eighty-two".