189778513 has 8 divisors (see below), whose sum is σ = 196447232. Its totient is φ = 183190896.

The previous prime is 189778489. The next prime is 189778541. The reversal of 189778513 is 315877981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 189778513 - 2⁵ = 189778481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189778553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15495 + ... + 24892.

It is an arithmetic number, because the mean of its divisors is an integer number (24555904).

Almost surely, 2^189778513 is an apocalyptic number.

It is an amenable number.

189778513 is a deficient number, since it is larger than the sum of its proper divisors (6668719).

189778513 is a wasteful number, since it uses less digits than its factorization.

189778513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40551.

The product of its digits is 423360, while the sum is 49.

The square root of 189778513 is about 13776.0122314115. The cubic root of 189778513 is about 574.6662340241. Note that the first 3 decimals are identical.

The spelling of 189778513 in words is "one hundred eighty-nine million, seven hundred seventy-eight thousand, five hundred thirteen".