189898145 has 4 divisors (see below), whose sum is σ = 227877780. Its totient is φ = 151918512.

The previous prime is 189898139. The next prime is 189898151. The reversal of 189898145 is 541898981.

It is a happy number.

189898145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (189898139) and next prime (189898151).

It can be written as a sum of positive squares in 2 ways, for example, as 64368529 + 125529616 = 8023^2 + 11204^2 .

It is a cyclic number.

It is not a de Polignac number, because 189898145 - 2⁸ = 189897889 is a prime.

It is a super-2 number, since 2×189898145² = 72122610948882050, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18989810 + ... + 18989819.

It is an arithmetic number, because the mean of its divisors is an integer number (56969445).

Almost surely, 2^189898145 is an apocalyptic number.

It is an amenable number.

189898145 is a deficient number, since it is larger than the sum of its proper divisors (37979635).

189898145 is an equidigital number, since it uses as much as digits as its factorization.

189898145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37979634.

The product of its digits is 829440, while the sum is 53.

The square root of 189898145 is about 13780.3535876261. The cubic root of 189898145 is about 574.7869607756.

The spelling of 189898145 in words is "one hundred eighty-nine million, eight hundred ninety-eight thousand, one hundred forty-five".