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19431 = 3217127
BaseRepresentation
bin100101111100111
3222122200
410233213
51110211
6225543
7110436
oct45747
928580
1019431
1113665
12b2b3
138ac9
14711d
155b56
hex4be7

19431 has 12 divisors (see below), whose sum is σ = 29952. Its totient is φ = 12096.

The previous prime is 19429. The next prime is 19433. The reversal of 19431 is 13491.

It is an interprime number because it is at equal distance from previous prime (19429) and next prime (19433).

It is not a de Polignac number, because 19431 - 21 = 19429 is a prime.

It is a super-2 number, since 2×194312 = 755127522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90 + ... + 216.

It is an arithmetic number, because the mean of its divisors is an integer number (2496).

219431 is an apocalyptic number.

19431 is a deficient number, since it is larger than the sum of its proper divisors (10521).

19431 is a wasteful number, since it uses less digits than its factorization.

19431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150 (or 147 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 19431 is about 139.3951218659. The cubic root of 19431 is about 26.8842783900.

It can be divided in two parts, 194 and 31, that added together give a square (225 = 152).

The spelling of 19431 in words is "nineteen thousand, four hundred thirty-one".

Divisors: 1 3 9 17 51 127 153 381 1143 2159 6477 19431