1389866656 has 48 divisors (see below), whose sum is σ = 2789912160. Its totient is φ = 681452800.

The previous prime is 1389866651. The next prime is 1389866689. The reversal of 1389866656 is 6566689831.

It is a self number, because there is not a number n which added to its sum of digits gives 1389866656.

It is not an unprimeable number, because it can be changed into a prime (1389866651) 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, 343815 + ... + 347833.

It is an arithmetic number, because the mean of its divisors is an integer number (58123170).

Almost surely, 2^1389866656 is an apocalyptic number.

1389866656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1389866656 is an abundant number, since it is smaller than the sum of its proper divisors (1400045504).

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

1389866656 is a wasteful number, since it uses less digits than its factorization.

1389866656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4237 (or 4229 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 58.

The square root of 1389866656 is about 37280.9154394041. The cubic root of 1389866656 is about 1115.9833418633.

The spelling of 1389866656 in words is "one billion, three hundred eighty-nine million, eight hundred sixty-six thousand, six hundred fifty-six".