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BaseRepresentation
bin100011011110…
…1011111110001
31022000002002211
41012331133301
514230230334
61502412121
7314054101
oct106753761
938002084
1018601969
11a555a31
126291041
133b13ca9
142683201
151976a64
hex11bd7f1

18601969 has 9 divisors (see below), whose sum is σ = 19719417. Its totient is φ = 17545284.

The previous prime is 18601967. The next prime is 18602027. The reversal of 18601969 is 96910681.

18601969 = T286 + T287 + ... + T512.

The square root of 18601969 is 4313.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 18601969 - 21 = 18601967 is a prime.

It is a super-2 number, since 2×186019692 = 692066501353922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18601967) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 81834 + ... + 82060.

Almost surely, 218601969 is an apocalyptic number.

18601969 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18601969 is the 4313-rd square number.

18601969 is the 2157-th centered octagonal number.

It is an amenable number.

18601969 is a deficient number, since it is larger than the sum of its proper divisors (1117448).

18601969 is an frugal number, since it uses more digits than its factorization.

18601969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492 (or 246 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The cubic root of 18601969 is about 264.9636546808.

The spelling of 18601969 in words is "eighteen million, six hundred one thousand, nine hundred sixty-nine".