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31868 = 2231257
BaseRepresentation
bin111110001111100
31121201022
413301330
52004433
6403312
7161624
oct76174
947638
1031868
1121a41
1216538
1311675
14b884
159698
hex7c7c

31868 has 12 divisors (see below), whose sum is σ = 57792. Its totient is φ = 15360.

The previous prime is 31859. The next prime is 31873. The reversal of 31868 is 86813.

Subtracting 31868 from its reverse (86813), we obtain a palindrome (54945).

31868 is an undulating number in base 16.

It is a nialpdrome in base 14.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

31868 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5 + ... + 252.

It is an arithmetic number, because the mean of its divisors is an integer number (4816).

231868 is an apocalyptic number.

It is an amenable number.

31868 is a deficient number, since it is larger than the sum of its proper divisors (25924).

31868 is a wasteful number, since it uses less digits than its factorization.

31868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292 (or 290 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

The square root of 31868 is about 178.5161057160. The cubic root of 31868 is about 31.7043073489.

The spelling of 31868 in words is "thirty-one thousand, eight hundred sixty-eight".

Divisors: 1 2 4 31 62 124 257 514 1028 7967 15934 31868