189363813 has 4 divisors (see below), whose sum is σ = 252485088. Its totient is φ = 126242540.

The previous prime is 189363793. The next prime is 189363877. The reversal of 189363813 is 318363981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 189363813 - 2⁵ = 189363781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189363113) 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, 31560633 + ... + 31560638.

It is an arithmetic number, because the mean of its divisors is an integer number (63121272).

Almost surely, 2^189363813 is an apocalyptic number.

It is an amenable number.

189363813 is a deficient number, since it is larger than the sum of its proper divisors (63121275).

189363813 is an equidigital number, since it uses as much as digits as its factorization.

189363813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63121274.

The product of its digits is 93312, while the sum is 42.

The square root of 189363813 is about 13760.9524743021. The cubic root of 189363813 is about 574.2473459199.

The spelling of 189363813 in words is "one hundred eighty-nine million, three hundred sixty-three thousand, eight hundred thirteen".