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19000005 = 356771871
BaseRepresentation
bin100100001111…
…0101011000101
31022202022002220
41020132223011
514331000010
61515122553
7320332413
oct110365305
938668086
1019000005
11a7a7a92
126443459
133c2320b
1427482b3
151a04970
hex121eac5

19000005 has 16 divisors (see below), whose sum is σ = 30461184. Its totient is φ = 10112960.

The previous prime is 18999997. The next prime is 19000013. The reversal of 19000005 is 50000091.

It is an interprime number because it is at equal distance from previous prime (18999997) and next prime (19000013).

It is not a de Polignac number, because 19000005 - 23 = 18999997 is a prime.

It is a super-2 number, since 2×190000052 = 722000380000050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9220 + ... + 11090.

It is an arithmetic number, because the mean of its divisors is an integer number (1903824).

Almost surely, 219000005 is an apocalyptic number.

19000005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19000005 is a deficient number, since it is larger than the sum of its proper divisors (11461179).

19000005 is a wasteful number, since it uses less digits than its factorization.

19000005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2556.

The product of its (nonzero) digits is 45, while the sum is 15.

The square root of 19000005 is about 4358.8995170800. The cubic root of 19000005 is about 266.8401882792.

Adding to 19000005 its reverse (50000091), we get a palindrome (69000096).

The spelling of 19000005 in words is "nineteen million, five", and thus it is an aban number and an uban number.

Divisors: 1 3 5 15 677 1871 2031 3385 5613 9355 10155 28065 1266667 3800001 6333335 19000005