1387389432 has 64 divisors (see below), whose sum is σ = 4074860160. Its totient is φ = 388080000.

The previous prime is 1387389403. The next prime is 1387389433. The reversal of 1387389432 is 2349837831.

1387389432 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387389433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198694 + ... + 205557.

It is an arithmetic number, because the mean of its divisors is an integer number (63669690).

Almost surely, 2^1387389432 is an apocalyptic number.

1387389432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1387389432 is an abundant number, since it is smaller than the sum of its proper divisors (2687470728).

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

1387389432 is a wasteful number, since it uses less digits than its factorization.

1387389432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404284 (or 404280 counting only the distinct ones).

The product of its digits is 870912, while the sum is 48.

The square root of 1387389432 is about 37247.6768671551. The cubic root of 1387389432 is about 1115.3199245513.

The spelling of 1387389432 in words is "one billion, three hundred eighty-seven million, three hundred eighty-nine thousand, four hundred thirty-two".