1378278315 has 32 divisors (see below), whose sum is σ = 2594410560. Its totient is φ = 691840512.

The previous prime is 1378278313. The next prime is 1378278323. The reversal of 1378278315 is 5138728731.

1378278315 is a `hidden beast` number, since 1 + 378 + 278 + 3 + 1 + 5 = 666.

It is not a de Polignac number, because 1378278315 - 2¹ = 1378278313 is a prime.

It is a super-2 number, since 2×1378278315² = 3799302227198478450, which contains 22 as substring.

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

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

It is not an unprimeable number, because it can be changed into a prime (1378278313) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 297984 + ... + 302573.

It is an arithmetic number, because the mean of its divisors is an integer number (81075330).

Almost surely, 2^1378278315 is an apocalyptic number.

1378278315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1378278315 is a deficient number, since it is larger than the sum of its proper divisors (1216132245).

1378278315 is a wasteful number, since it uses less digits than its factorization.

1378278315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600588 (or 600582 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 1378278315 is about 37125.1709086975. The cubic root of 1378278315 is about 1112.8730902005.

The spelling of 1378278315 in words is "one billion, three hundred seventy-eight million, two hundred seventy-eight thousand, three hundred fifteen".