1272733821 has 12 divisors (see below), whose sum is σ = 1877508672. Its totient is φ = 830435976.

The previous prime is 1272733793. The next prime is 1272733831. The reversal of 1272733821 is 1283372721.

1272733821 is a `hidden beast` number, since 1 + 2 + 7 + 273 + 382 + 1 = 666.

It is not a de Polignac number, because 1272733821 - 2⁵ = 1272733789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272733831) 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 11 ways as a sum of consecutive naturals, for example, 1503991 + ... + 1504836.

It is an arithmetic number, because the mean of its divisors is an integer number (156459056).

Almost surely, 2^1272733821 is an apocalyptic number.

It is an amenable number.

1272733821 is a deficient number, since it is larger than the sum of its proper divisors (604774851).

1272733821 is a wasteful number, since it uses less digits than its factorization.

1272733821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3008880 (or 3008877 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 1272733821 is about 35675.3951765079. The cubic root of 1272733821 is about 1083.7086212415.

The spelling of 1272733821 in words is "one billion, two hundred seventy-two million, seven hundred thirty-three thousand, eight hundred twenty-one".