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189664391 = 797279329
BaseRepresentation
bin10110100111000…
…00110010000111
3111012212221122002
423103200302013
5342023230031
630453055515
74462056260
oct1323406207
9435787562
10189664391
1198073734
125362759b
13303a8a67
141b291967
15119b6ccb
hexb4e0c87

189664391 has 8 divisors (see below), whose sum is σ = 218994720. Its totient is φ = 160892928.

The previous prime is 189664373. The next prime is 189664451. The reversal of 189664391 is 193466981.

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

It is not a de Polignac number, because 189664391 - 210 = 189663367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189664351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138986 + ... + 140343.

It is an arithmetic number, because the mean of its divisors is an integer number (27374340).

Almost surely, 2189664391 is an apocalyptic number.

189664391 is a deficient number, since it is larger than the sum of its proper divisors (29330329).

189664391 is an equidigital number, since it uses as much as digits as its factorization.

189664391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279433.

The product of its digits is 279936, while the sum is 47.

The square root of 189664391 is about 13771.8695535501. The cubic root of 189664391 is about 574.5510204011.

The spelling of 189664391 in words is "one hundred eighty-nine million, six hundred sixty-four thousand, three hundred ninety-one".

Divisors: 1 7 97 679 279329 1955303 27094913 189664391