1389433960 has 16 divisors (see below), whose sum is σ = 3126226500. Its totient is φ = 555773568.

The previous prime is 1389433951. The next prime is 1389433963. The reversal of 1389433960 is 693349831.

It can be written as a sum of positive squares in 2 ways, for example, as 1180747044 + 208686916 = 34362^2 + 14446^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1389433960.

It is not an unprimeable number, because it can be changed into a prime (1389433963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17367885 + ... + 17367964.

Almost surely, 2^1389433960 is an apocalyptic number.

1389433960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1389433960 is an abundant number, since it is smaller than the sum of its proper divisors (1736792540).

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

1389433960 is a wasteful number, since it uses less digits than its factorization.

1389433960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34735860 (or 34735856 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 46.

The square root of 1389433960 is about 37275.1118039906. Note that the first 3 decimals coincide. The cubic root of 1389433960 is about 1115.8675198058.

The spelling of 1389433960 in words is "one billion, three hundred eighty-nine million, four hundred thirty-three thousand, nine hundred sixty".