1318978047 has 4 divisors (see below), whose sum is σ = 1758637400. Its totient is φ = 879318696.

The previous prime is 1318978007. The next prime is 1318978093. The reversal of 1318978047 is 7408798131.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1318978047 - 2⁸ = 1318977791 is a prime.

It is a super-3 number, since 3×1318978047³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1318977987 and 1318978005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318978007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219829672 + ... + 219829677.

It is an arithmetic number, because the mean of its divisors is an integer number (439659350).

Almost surely, 2^1318978047 is an apocalyptic number.

1318978047 is a deficient number, since it is larger than the sum of its proper divisors (439659353).

1318978047 is an equidigital number, since it uses as much as digits as its factorization.

1318978047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439659352.

The product of its (nonzero) digits is 338688, while the sum is 48.

The square root of 1318978047 is about 36317.7373606892. The cubic root of 1318978047 is about 1096.6781457560.

The spelling of 1318978047 in words is "one billion, three hundred eighteen million, nine hundred seventy-eight thousand, forty-seven".