1378952817 has 16 divisors (see below), whose sum is σ = 2011004928. Its totient is φ = 833539280.

The previous prime is 1378952801. The next prime is 1378952837. The reversal of 1378952817 is 7182598731.

It is a cyclic number.

It is not a de Polignac number, because 1378952817 - 2⁴ = 1378952801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1378952817.

It is not an unprimeable number, because it can be changed into a prime (1378952837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41913 + ... + 67190.

It is an arithmetic number, because the mean of its divisors is an integer number (125687808).

Almost surely, 2^1378952817 is an apocalyptic number.

It is an amenable number.

1378952817 is a deficient number, since it is larger than the sum of its proper divisors (632052111).

1378952817 is a wasteful number, since it uses less digits than its factorization.

1378952817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109500.

The product of its digits is 846720, while the sum is 51.

The square root of 1378952817 is about 37134.2539577679. The cubic root of 1378952817 is about 1113.0545999149.

The spelling of 1378952817 in words is "one billion, three hundred seventy-eight million, nine hundred fifty-two thousand, eight hundred seventeen".