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19028965 = 55097477
BaseRepresentation
bin100100010010…
…1101111100101
31022210202211111
41020211233211
514332411330
61515505021
7320513014
oct110455745
938722744
1019028965
11a81781a
126458171
133c33457
142754a7b
151a0d32a
hex1225be5

19028965 has 8 divisors (see below), whose sum is σ = 22882680. Its totient is φ = 15191232.

The previous prime is 19028963. The next prime is 19028969. The reversal of 19028965 is 56982091.

It can be written as a sum of positive squares in 4 ways, for example, as 9400356 + 9628609 = 3066^2 + 3103^2 .

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 19028965 - 21 = 19028963 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19028963) 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, 1194 + ... + 6283.

It is an arithmetic number, because the mean of its divisors is an integer number (2860335).

Almost surely, 219028965 is an apocalyptic number.

It is an amenable number.

19028965 is a deficient number, since it is larger than the sum of its proper divisors (3853715).

19028965 is an equidigital number, since it uses as much as digits as its factorization.

19028965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7991.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 19028965 is about 4362.2201915997. The cubic root of 19028965 is about 266.9756929623.

The spelling of 19028965 in words is "nineteen million, twenty-eight thousand, nine hundred sixty-five".

Divisors: 1 5 509 2545 7477 37385 3805793 19028965