189973620 has 48 divisors (see below), whose sum is σ = 591030720. Its totient is φ = 50659488.

The previous prime is 189973607. The next prime is 189973621. The reversal of 189973620 is 26379981.

189973620 is a `hidden beast` number, since 18 + 9 + 9 + 7 + 3 + 620 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189973621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175362 + ... + 176441.

It is an arithmetic number, because the mean of its divisors is an integer number (12313140).

Almost surely, 2^189973620 is an apocalyptic number.

189973620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189973620 is an abundant number, since it is smaller than the sum of its proper divisors (401057100).

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

189973620 is a wasteful number, since it uses less digits than its factorization.

189973620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351821 (or 351813 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 189973620 is about 13783.0918156994. The cubic root of 189973620 is about 574.8631003639.

The spelling of 189973620 in words is "one hundred eighty-nine million, nine hundred seventy-three thousand, six hundred twenty".