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18918693 = 327872671
BaseRepresentation
bin100100000101…
…0110100100101
31022121011120100
41020022310211
514320344233
61513254313
7316543353
oct110126445
938534510
1018918693
11a751992
126404399
133bc51c1
1427267d3
1519da813
hex120ad25

18918693 has 12 divisors (see below), whose sum is σ = 27371968. Its totient is φ = 12591720.

The previous prime is 18918619. The next prime is 18918709. The reversal of 18918693 is 39681981.

It is not a de Polignac number, because 18918693 - 28 = 18918437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18918593) 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, 5748 + ... + 8418.

Almost surely, 218918693 is an apocalyptic number.

It is an amenable number.

18918693 is a deficient number, since it is larger than the sum of its proper divisors (8453275).

18918693 is a wasteful number, since it uses less digits than its factorization.

18918693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3464 (or 3461 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 18918693 is about 4349.5623917815. The cubic root of 18918693 is about 266.4589895205.

The spelling of 18918693 in words is "eighteen million, nine hundred eighteen thousand, six hundred ninety-three".

Divisors: 1 3 9 787 2361 2671 7083 8013 24039 2102077 6306231 18918693