1273918864 has 15 divisors (see below), whose sum is σ = 2468494443. Its totient is φ = 636888048.

The previous prime is 1273918829. The next prime is 1273918883. The reversal of 1273918864 is 4688193721.

The square root of 1273918864 is 35692.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

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 2 ways as a sum of consecutive naturals, for example, 138307 + ... + 147229.

Almost surely, 2^1273918864 is an apocalyptic number.

1273918864 is the 35692-nd square number.

It is an amenable number.

1273918864 is a deficient number, since it is larger than the sum of its proper divisors (1194575579).

1273918864 is an frugal number, since it uses more digits than its factorization.

1273918864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17854 (or 8925 counting only the distinct ones).

The product of its digits is 580608, while the sum is 49.

The cubic root of 1273918864 is about 1084.0448640900.

Multiplying 1273918864 by its sum of digits (49), we get a square (62422024336 = 249844²).

The spelling of 1273918864 in words is "one billion, two hundred seventy-three million, nine hundred eighteen thousand, eight hundred sixty-four".