189997355 has 16 divisors (see below), whose sum is σ = 243635040. Its totient is φ = 141737472.

The previous prime is 189997351. The next prime is 189997361. The reversal of 189997355 is 553799981.

It is a cyclic number.

It is not a de Polignac number, because 189997355 - 2² = 189997351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189997355.

It is not an unprimeable number, because it can be changed into a prime (189997351) 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, 989 + ... + 19518.

It is an arithmetic number, because the mean of its divisors is an integer number (15227190).

Almost surely, 2^189997355 is an apocalyptic number.

189997355 is a deficient number, since it is larger than the sum of its proper divisors (53637685).

189997355 is a wasteful number, since it uses less digits than its factorization.

189997355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20638.

The product of its digits is 3061800, while the sum is 56.

The square root of 189997355 is about 13783.9528075222. The cubic root of 189997355 is about 574.8870401921.

The spelling of 189997355 in words is "one hundred eighty-nine million, nine hundred ninety-seven thousand, three hundred fifty-five".