1387906388 has 24 divisors (see below), whose sum is σ = 2764843200. Its totient is φ = 603437120.

The previous prime is 1387906379. The next prime is 1387906409. The reversal of 1387906388 is 8836097831.

It is a congruent number.

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, 684713 + ... + 686736.

It is an arithmetic number, because the mean of its divisors is an integer number (115201800).

Almost surely, 2^1387906388 is an apocalyptic number.

It is an amenable number.

1387906388 is a deficient number, since it is larger than the sum of its proper divisors (1376936812).

1387906388 is a wasteful number, since it uses less digits than its factorization.

1387906388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1371487 (or 1371485 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 53.

The square root of 1387906388 is about 37254.6156603447. The cubic root of 1387906388 is about 1115.4584340224.

The spelling of 1387906388 in words is "one billion, three hundred eighty-seven million, nine hundred six thousand, three hundred eighty-eight".