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19081389 = 347135329
BaseRepresentation
bin100100011001…
…0100010101101
31022220102202010
41020302202231
514341101024
61520551433
7321121605
oct110624255
938812663
1019081389
11a853148
126482579
133c51282
142769c05
151a1db29
hex12328ad

19081389 has 8 divisors (see below), whose sum is σ = 25983360. Its totient is φ = 12450176.

The previous prime is 19081373. The next prime is 19081409. The reversal of 19081389 is 98318091.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 19081389 - 24 = 19081373 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19081319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67524 + ... + 67805.

It is an arithmetic number, because the mean of its divisors is an integer number (3247920).

Almost surely, 219081389 is an apocalyptic number.

It is an amenable number.

19081389 is a deficient number, since it is larger than the sum of its proper divisors (6901971).

19081389 is a wasteful number, since it uses less digits than its factorization.

19081389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135379.

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 19081389 is about 4368.2249255275. The cubic root of 19081389 is about 267.2206371062.

The spelling of 19081389 in words is "nineteen million, eighty-one thousand, three hundred eighty-nine".

Divisors: 1 3 47 141 135329 405987 6360463 19081389