1388637852 has 36 divisors (see below), whose sum is σ = 3769161480. Its totient is φ = 396753504.

The previous prime is 1388637851. The next prime is 1388637869. The reversal of 1388637852 is 2587368831.

1388637852 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 1388637795 and 1388637804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388637851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1180227 + ... + 1181402.

It is an arithmetic number, because the mean of its divisors is an integer number (104698930).

Almost surely, 2^1388637852 is an apocalyptic number.

1388637852 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1388637852 is an abundant number, since it is smaller than the sum of its proper divisors (2380523628).

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

1388637852 is a wasteful number, since it uses less digits than its factorization.

1388637852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2361650 (or 2361641 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 51.

The square root of 1388637852 is about 37264.4314595030. The cubic root of 1388637852 is about 1115.6543584738.

The spelling of 1388637852 in words is "one billion, three hundred eighty-eight million, six hundred thirty-seven thousand, eight hundred fifty-two".