1378913987 has 8 divisors (see below), whose sum is σ = 1504723440. Its totient is φ = 1253180160.

The previous prime is 1378913969. The next prime is 1378913989. The reversal of 1378913987 is 7893198731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1378913987 - 2³⁰ = 305172163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1378913989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23339 + ... + 57467.

It is an arithmetic number, because the mean of its divisors is an integer number (188090430).

Almost surely, 2^1378913987 is an apocalyptic number.

1378913987 is a deficient number, since it is larger than the sum of its proper divisors (125809453).

1378913987 is a wasteful number, since it uses less digits than its factorization.

1378913987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37813.

The product of its digits is 2286144, while the sum is 56.

The square root of 1378913987 is about 37133.7311214481. The cubic root of 1378913987 is about 1113.0441522971.

The spelling of 1378913987 in words is "one billion, three hundred seventy-eight million, nine hundred thirteen thousand, nine hundred eighty-seven".