189820755 has 24 divisors (see below), whose sum is σ = 332422272. Its totient is φ = 100191744.

The previous prime is 189820753. The next prime is 189820777. The reversal of 189820755 is 557028981.

It is a happy number.

It is not a de Polignac number, because 189820755 - 2¹ = 189820753 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 189820755.

It is not an unprimeable number, because it can be changed into a prime (189820753) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17379 + ... + 26108.

It is an arithmetic number, because the mean of its divisors is an integer number (13850928).

Almost surely, 2^189820755 is an apocalyptic number.

189820755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

189820755 is a deficient number, since it is larger than the sum of its proper divisors (142601517).

189820755 is a wasteful number, since it uses less digits than its factorization.

189820755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43595 (or 43592 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 45.

The square root of 189820755 is about 13777.5453183795. The cubic root of 189820755 is about 574.7088683733.

The spelling of 189820755 in words is "one hundred eighty-nine million, eight hundred twenty thousand, seven hundred fifty-five".