1329378772 has 24 divisors (see below), whose sum is σ = 2393349896. Its totient is φ = 645625728.

The previous prime is 1329378769. The next prime is 1329378779. The reversal of 1329378772 is 2778739231.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 224880016 + 1104498756 = 14996^2 + 33234^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1329378779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83398 + ... + 98050.

Almost surely, 2^1329378772 is an apocalyptic number.

It is an amenable number.

1329378772 is a deficient number, since it is larger than the sum of its proper divisors (1063971124).

1329378772 is a wasteful number, since it uses less digits than its factorization.

1329378772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15307 (or 15305 counting only the distinct ones).

The product of its digits is 889056, while the sum is 49.

The square root of 1329378772 is about 36460.6468949743. The cubic root of 1329378772 is about 1099.5531992582.

The spelling of 1329378772 in words is "one billion, three hundred twenty-nine million, three hundred seventy-eight thousand, seven hundred seventy-two".