1389976926 has 32 divisors (see below), whose sum is σ = 3015358080. Its totient is φ = 424605024.

The previous prime is 1389976883. The next prime is 1389976943. The reversal of 1389976926 is 6296799831.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1389976926.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53260 + ... + 74943.

It is an arithmetic number, because the mean of its divisors is an integer number (94229940).

Almost surely, 2^1389976926 is an apocalyptic number.

1389976926 is an abundant number, since it is smaller than the sum of its proper divisors (1625381154).

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

1389976926 is a wasteful number, since it uses less digits than its factorization.

1389976926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128360.

The product of its digits is 8817984, while the sum is 60.

The square root of 1389976926 is about 37282.3943168890. The cubic root of 1389976926 is about 1116.0128545814.

The spelling of 1389976926 in words is "one billion, three hundred eighty-nine million, nine hundred seventy-six thousand, nine hundred twenty-six".