1272823540 has 12 divisors (see below), whose sum is σ = 2672929476. Its totient is φ = 509129408.

The previous prime is 1272823493. The next prime is 1272823549. The reversal of 1272823540 is 453282721.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 881258596 + 391564944 = 29686^2 + 19788^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1272823496 and 1272823505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272823549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31820569 + ... + 31820608.

It is an arithmetic number, because the mean of its divisors is an integer number (222744123).

Almost surely, 2^1272823540 is an apocalyptic number.

1272823540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1272823540 is an abundant number, since it is smaller than the sum of its proper divisors (1400105936).

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

1272823540 is a wasteful number, since it uses less digits than its factorization.

1272823540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63641186 (or 63641184 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 1272823540 is about 35676.6525896138. The cubic root of 1272823540 is about 1083.7340853167.

The spelling of 1272823540 in words is "one billion, two hundred seventy-two million, eight hundred twenty-three thousand, five hundred forty".