1389643996 has 24 divisors (see below), whose sum is σ = 2682825264. Its totient is φ = 625729920.

The previous prime is 1389643991. The next prime is 1389643999. The reversal of 1389643996 is 6993469831.

It is a super-2 number, since 2×1389643996² = 3862220871237696032, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1389643996.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389643991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323770 + ... + 328033.

It is an arithmetic number, because the mean of its divisors is an integer number (111784386).

Almost surely, 2^1389643996 is an apocalyptic number.

It is an amenable number.

1389643996 is a deficient number, since it is larger than the sum of its proper divisors (1293181268).

1389643996 is a wasteful number, since it uses less digits than its factorization.

1389643996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651861 (or 651859 counting only the distinct ones).

The product of its digits is 7558272, while the sum is 58.

The square root of 1389643996 is about 37277.9290733807. The cubic root of 1389643996 is about 1115.9237442704.

The spelling of 1389643996 in words is "one billion, three hundred eighty-nine million, six hundred forty-three thousand, nine hundred ninety-six".