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18681354 = 2374271
BaseRepresentation
bin100011101000…
…0111000001010
31022011010000000
41013100320022
514240300404
61504223430
7314534406
oct107207012
938133000
1018681354
11a5aa63a
12630ab76
133b41173
1426a4106
151990339
hex11d0e0a

18681354 has 32 divisors (see below), whose sum is σ = 42036480. Its totient is φ = 6225660.

The previous prime is 18681349. The next prime is 18681371. The reversal of 18681354 is 45318681.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2239 + ... + 6509.

It is an arithmetic number, because the mean of its divisors is an integer number (1313640).

Almost surely, 218681354 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18681354, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21018240).

18681354 is an abundant number, since it is smaller than the sum of its proper divisors (23355126).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18681354 is an frugal number, since it uses more digits than its factorization.

18681354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4294 (or 4276 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 18681354 is about 4322.1931932758. The cubic root of 18681354 is about 265.3400357866.

The spelling of 18681354 in words is "eighteen million, six hundred eighty-one thousand, three hundred fifty-four".

Divisors: 1 2 3 6 9 18 27 54 81 162 243 486 729 1458 2187 4271 4374 8542 12813 25626 38439 76878 115317 230634 345951 691902 1037853 2075706 3113559 6227118 9340677 18681354