1387921384 has 32 divisors (see below), whose sum is σ = 2719584000. Its totient is φ = 662789952.

The previous prime is 1387921343. The next prime is 1387921439. The reversal of 1387921384 is 4831297831.

It is a Smith number, since the sum of its digits (46) 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 (46).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125137 + ... + 135775.

It is an arithmetic number, because the mean of its divisors is an integer number (84987000).

Almost surely, 2^1387921384 is an apocalyptic number.

It is an amenable number.

1387921384 is a deficient number, since it is larger than the sum of its proper divisors (1331662616).

1387921384 is a wasteful number, since it uses less digits than its factorization.

1387921384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11377 (or 11373 counting only the distinct ones).

The product of its digits is 290304, while the sum is 46.

The square root of 1387921384 is about 37254.8169234530. The cubic root of 1387921384 is about 1115.4624514294.

The spelling of 1387921384 in words is "one billion, three hundred eighty-seven million, nine hundred twenty-one thousand, three hundred eighty-four".