189898785 has 24 divisors (see below), whose sum is σ = 332242560. Its totient is φ = 100330272.

The previous prime is 189898783. The next prime is 189898811. The reversal of 189898785 is 587898981.

It is not a de Polignac number, because 189898785 - 2¹ = 189898783 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (189898781) 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, 14905 + ... + 24534.

It is an arithmetic number, because the mean of its divisors is an integer number (13843440).

Almost surely, 2^189898785 is an apocalyptic number.

189898785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

189898785 is a deficient number, since it is larger than the sum of its proper divisors (142343775).

189898785 is a wasteful number, since it uses less digits than its factorization.

189898785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39557 (or 39554 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 63.

The square root of 189898785 is about 13780.3768090717. The cubic root of 189898785 is about 574.7876064959.

The spelling of 189898785 in words is "one hundred eighty-nine million, eight hundred ninety-eight thousand, seven hundred eighty-five".