189518449 has 4 divisors (see below), whose sum is σ = 189547236. Its totient is φ = 189489664.

The previous prime is 189518437. The next prime is 189518479. The reversal of 189518449 is 944815981.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 944815981 = 199 ⋅4747819.

It can be written as a sum of positive squares in 2 ways, for example, as 123210000 + 66308449 = 11100^2 + 8143^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189518449 is a prime.

It is a super-2 number, since 2×189518449² = 71834485022731202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189518479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 897 + ... + 19489.

It is an arithmetic number, because the mean of its divisors is an integer number (47386809).

Almost surely, 2^189518449 is an apocalyptic number.

It is an amenable number.

189518449 is a deficient number, since it is larger than the sum of its proper divisors (28787).

189518449 is a wasteful number, since it uses less digits than its factorization.

189518449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28786.

The product of its digits is 414720, while the sum is 49.

The square root of 189518449 is about 13766.5699794829. The cubic root of 189518449 is about 574.4036150450.

The spelling of 189518449 in words is "one hundred eighty-nine million, five hundred eighteen thousand, four hundred forty-nine".