189551970 has 48 divisors (see below), whose sum is σ = 514268352. Its totient is φ = 48348960.

The previous prime is 189551959. The next prime is 189551977. The reversal of 189551970 is 79155981.

189551970 is a `hidden beast` number, since 1 + 8 + 9 + 551 + 97 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (189551977) 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 23 ways as a sum of consecutive naturals, for example, 43716 + ... + 47855.

It is an arithmetic number, because the mean of its divisors is an integer number (10713924).

Almost surely, 2^189551970 is an apocalyptic number.

189551970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189551970 is an abundant number, since it is smaller than the sum of its proper divisors (324716382).

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

189551970 is a wasteful number, since it uses less digits than its factorization.

189551970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91607 (or 91604 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 45.

The square root of 189551970 is about 13767.7874039368. The cubic root of 189551970 is about 574.4374788518.

The spelling of 189551970 in words is "one hundred eighty-nine million, five hundred fifty-one thousand, nine hundred seventy".