1389944088 has 96 divisors (see below), whose sum is σ = 4267426800. Its totient is φ = 405160704.

The previous prime is 1389944081. The next prime is 1389944099. The reversal of 1389944088 is 8804499831.

1389944088 is a `hidden beast` number, since 1 + 38 + 99 + 440 + 88 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389944081) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21295 + ... + 56862.

Almost surely, 2^1389944088 is an apocalyptic number.

1389944088 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1389944088 is an abundant number, since it is smaller than the sum of its proper divisors (2877482712).

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

1389944088 is a wasteful number, since it uses less digits than its factorization.

1389944088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78201 (or 78194 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

The square root of 1389944088 is about 37281.9539187527. The cubic root of 1389944088 is about 1116.0040659658.

The spelling of 1389944088 in words is "one billion, three hundred eighty-nine million, nine hundred forty-four thousand, eighty-eight".