1378387867 has 4 divisors (see below), whose sum is σ = 1378462680. Its totient is φ = 1378313056.

The previous prime is 1378387853. The next prime is 1378387877. The reversal of 1378387867 is 7687838731.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1378387867 - 2²⁷ = 1244170139 is a prime.

It is a super-2 number, since 2×1378387867² = 3799906223785619378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378387877) 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, 11859 + ... + 53827.

It is an arithmetic number, because the mean of its divisors is an integer number (344615670).

Almost surely, 2^1378387867 is an apocalyptic number.

1378387867 is a deficient number, since it is larger than the sum of its proper divisors (74813).

1378387867 is an equidigital number, since it uses as much as digits as its factorization.

1378387867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74812.

The product of its digits is 9483264, while the sum is 58.

The square root of 1378387867 is about 37126.6463203990. The cubic root of 1378387867 is about 1112.9025748702.

The spelling of 1378387867 in words is "one billion, three hundred seventy-eight million, three hundred eighty-seven thousand, eight hundred sixty-seven".