1378265715 has 48 divisors (see below), whose sum is σ = 2412933120. Its totient is φ = 727755840.

The previous prime is 1378265699. The next prime is 1378265729. The reversal of 1378265715 is 5175628731.

It is a happy number.

1378265715 is a `hidden beast` number, since 1 + 3 + 78 + 2 + 6 + 571 + 5 = 666.

It is not a de Polignac number, because 1378265715 - 2⁴ = 1378265699 is a prime.

It is a super-2 number, since 2×1378265715² = 3799232762288922450, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3598414 + ... + 3598796.

It is an arithmetic number, because the mean of its divisors is an integer number (50269440).

Almost surely, 2^1378265715 is an apocalyptic number.

1378265715 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1378265715 is a deficient number, since it is larger than the sum of its proper divisors (1034667405).

1378265715 is a wasteful number, since it uses less digits than its factorization.

1378265715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984 (or 981 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The square root of 1378265715 is about 37125.0012121212. The cubic root of 1378265715 is about 1112.8696989542.

It can be divided in two parts, 13782 and 65715, that added together give a palindrome (79497).

The spelling of 1378265715 in words is "one billion, three hundred seventy-eight million, two hundred sixty-five thousand, seven hundred fifteen".