189898307 has 4 divisors (see below), whose sum is σ = 193011456. Its totient is φ = 186785160.

The previous prime is 189898253. The next prime is 189898333. The reversal of 189898307 is 703898981.

189898307 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, and also an emirpimes, since its reverse is a distinct semiprime: 703898981 = 157 ⋅4483433.

It is a cyclic number.

It is not a de Polignac number, because 189898307 - 2⁶ = 189898243 is a prime.

It is a super-2 number, since 2×189898307² = 72122734002932498, which contains 22 as substring.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189898367) 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, 1556483 + ... + 1556604.

It is an arithmetic number, because the mean of its divisors is an integer number (48252864).

Almost surely, 2^189898307 is an apocalyptic number.

189898307 is a deficient number, since it is larger than the sum of its proper divisors (3113149).

189898307 is an equidigital number, since it uses as much as digits as its factorization.

189898307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3113148.

The product of its (nonzero) digits is 870912, while the sum is 53.

The square root of 189898307 is about 13780.3594655582. The cubic root of 189898307 is about 574.7871242237.

The spelling of 189898307 in words is "one hundred eighty-nine million, eight hundred ninety-eight thousand, three hundred seven".