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1918 = 27137
BaseRepresentation
bin11101111110
32122001
4131332
530133
612514
75410
oct3576
92561
101918
111494
12113a
13b47
149b0
1587d
hex77e

1918 has 8 divisors (see below), whose sum is σ = 3312. Its totient is φ = 816.

The previous prime is 1913. The next prime is 1931. The reversal of 1918 is 8191.

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

It is a magnanimous number.

It is a plaindrome in base 12 and base 16.

It is a nialpdrome in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 1895 and 1904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1913) 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, 55 + ... + 82.

It is an arithmetic number, because the mean of its divisors is an integer number (414).

1918 is the 28-th heptagonal number.

1918 is a deficient number, since it is larger than the sum of its proper divisors (1394).

1918 is a wasteful number, since it uses less digits than its factorization.

1918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146.

The product of its digits is 72, while the sum is 19.

The square root of 1918 is about 43.7949768809. The cubic root of 1918 is about 12.4246129238.

The spelling of 1918 in words is "one thousand, nine hundred eighteen".

Divisors: 1 2 7 14 137 274 959 1918