1378438887 has 16 divisors (see below), whose sum is σ = 2101012992. Its totient is φ = 787478880.

The previous prime is 1378438879. The next prime is 1378438891. The reversal of 1378438887 is 7888348731.

It is not a de Polignac number, because 1378438887 - 2³ = 1378438879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378438837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127462 + ... + 137852.

It is an arithmetic number, because the mean of its divisors is an integer number (131313312).

Almost surely, 2^1378438887 is an apocalyptic number.

1378438887 is a deficient number, since it is larger than the sum of its proper divisors (722574105).

1378438887 is a wasteful number, since it uses less digits than its factorization.

1378438887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16718.

The product of its digits is 7225344, while the sum is 57.

The square root of 1378438887 is about 37127.3334216181. Note that the first 3 decimals coincide. The cubic root of 1378438887 is about 1112.9163057874.

The spelling of 1378438887 in words is "one billion, three hundred seventy-eight million, four hundred thirty-eight thousand, eight hundred eighty-seven".