1273523645 has 8 divisors (see below), whose sum is σ = 1543359960. Its totient is φ = 1008731200.

The previous prime is 1273523611. The next prime is 1273523651. The reversal of 1273523645 is 5463253721.

It can be written as a sum of positive squares in 4 ways, for example, as 837465721 + 436057924 = 28939^2 + 20882^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1273523645 - 2¹² = 1273519549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1273523599 and 1273523608.

It is a congruent number.

It is an unprimeable number.

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, 1260410 + ... + 1261419.

It is an arithmetic number, because the mean of its divisors is an integer number (192919995).

Almost surely, 2^1273523645 is an apocalyptic number.

It is an amenable number.

1273523645 is a deficient number, since it is larger than the sum of its proper divisors (269836315).

1273523645 is a wasteful number, since it uses less digits than its factorization.

1273523645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2521935.

The product of its digits is 151200, while the sum is 38.

The square root of 1273523645 is about 35686.4630497336. The cubic root of 1273523645 is about 1083.9327482526.

The spelling of 1273523645 in words is "one billion, two hundred seventy-three million, five hundred twenty-three thousand, six hundred forty-five".