189908000012 has 6 divisors (see below), whose sum is σ = 332339000028. Its totient is φ = 94954000004.

The previous prime is 189908000011. The next prime is 189908000053. The reversal of 189908000012 is 210000809981.

It is a self number, because there is not a number n which added to its sum of digits gives 189908000012.

It is not an unprimeable number, because it can be changed into a prime (189908000011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23738499998 + ... + 23738500005.

It is an arithmetic number, because the mean of its divisors is an integer number (55389833338).

Almost surely, 2^189908000012 is an apocalyptic number.

It is an amenable number.

189908000012 is a deficient number, since it is larger than the sum of its proper divisors (142431000016).

189908000012 is a wasteful number, since it uses less digits than its factorization.

189908000012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47477000007 (or 47477000005 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 38.

Adding to 189908000012 its reverse (210000809981), we get a palindrome (399908809993).

The spelling of 189908000012 in words is "one hundred eighty-nine billion, nine hundred eight million, twelve", and thus it is an aban number.