189917982 has 24 divisors (see below), whose sum is σ = 435694896. Its totient is φ = 59582016.

The previous prime is 189917963. The next prime is 189917989. The reversal of 189917982 is 289719981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189917989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 310018 + ... + 310629.

It is an arithmetic number, because the mean of its divisors is an integer number (18153954).

Almost surely, 2^189917982 is an apocalyptic number.

189917982 is an abundant number, since it is smaller than the sum of its proper divisors (245776914).

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

189917982 is a wasteful number, since it uses less digits than its factorization.

189917982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620672 (or 620669 counting only the distinct ones).

The product of its digits is 653184, while the sum is 54.

The square root of 189917982 is about 13781.0733253981. The cubic root of 189917982 is about 574.8069744026.

It can be divided in two parts, 1899 and 17982, that added together give a square (19881 = 141²).

The spelling of 189917982 in words is "one hundred eighty-nine million, nine hundred seventeen thousand, nine hundred eighty-two".