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19409 = 131493
BaseRepresentation
bin100101111010001
3222121212
410233101
51110114
6225505
7110405
oct45721
928555
1019409
1113645
12b295
138ab0
147105
155b3e
hex4bd1

19409 has 4 divisors (see below), whose sum is σ = 20916. Its totient is φ = 17904.

The previous prime is 19403. The next prime is 19417. The reversal of 19409 is 90491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90491 = 175323.

It can be written as a sum of positive squares in 2 ways, for example, as 10000 + 9409 = 100^2 + 97^2 .

It is a cyclic number.

It is not a de Polignac number, because 19409 - 212 = 15313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19403) 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, 734 + ... + 759.

It is an arithmetic number, because the mean of its divisors is an integer number (5229).

219409 is an apocalyptic number.

It is an amenable number.

19409 is a deficient number, since it is larger than the sum of its proper divisors (1507).

19409 is a wasteful number, since it uses less digits than its factorization.

19409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 19409 is about 139.3161871428. The cubic root of 19409 is about 26.8741283294.

The spelling of 19409 in words is "nineteen thousand, four hundred nine".

Divisors: 1 13 1493 19409