1388635850 has 48 divisors (see below), whose sum is σ = 2985076800. Its totient is φ = 470743680.

The previous prime is 1388635841. The next prime is 1388635873. The reversal of 1388635850 is 585368831.

It is a junction number, because it is equal to n+sod(n) for n = 1388635795 and 1388635804.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8861 + ... + 53439.

It is an arithmetic number, because the mean of its divisors is an integer number (62189100).

Almost surely, 2^1388635850 is an apocalyptic number.

1388635850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1388635850 is an abundant number, since it is smaller than the sum of its proper divisors (1596440950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1388635850 is a wasteful number, since it uses less digits than its factorization.

1388635850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44687 (or 44682 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 47.

The square root of 1388635850 is about 37264.4045974171. The cubic root of 1388635850 is about 1115.6538223271.

The spelling of 1388635850 in words is "one billion, three hundred eighty-eight million, six hundred thirty-five thousand, eight hundred fifty".