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12749 = 111961
BaseRepresentation
bin11000111001101
3122111012
43013031
5401444
6135005
752112
oct30715
918435
1012749
119640
127465
135a59
144909
153b9e
hex31cd

12749 has 8 divisors (see below), whose sum is σ = 14880. Its totient is φ = 10800.

The previous prime is 12743. The next prime is 12757. The reversal of 12749 is 94721.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-12749 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179 + ... + 239.

It is an arithmetic number, because the mean of its divisors is an integer number (1860).

212749 is an apocalyptic number.

12749 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12749 is a deficient number, since it is larger than the sum of its proper divisors (2131).

12749 is a wasteful number, since it uses less digits than its factorization.

12749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91.

The product of its digits is 504, while the sum is 23.

The square root of 12749 is about 112.9114697451. The cubic root of 12749 is about 23.3610328639.

The spelling of 12749 in words is "twelve thousand, seven hundred forty-nine".

Divisors: 1 11 19 61 209 671 1159 12749