Base | Representation |
---|---|
bin | 100011000000… |
… | …1000011110101 |
3 | 1021112111112101 |
4 | 1012001003311 |
5 | 14144320141 |
6 | 1453222101 |
7 | 312003301 |
oct | 106010365 |
9 | 37474471 |
10 | 18354421 |
11 | a3a6a48 |
12 | 6191931 |
13 | 3a58407 |
14 | 261ad01 |
15 | 1928531 |
hex | 11810f5 |
18354421 has 8 divisors (see below), whose sum is σ = 18934784. Its totient is φ = 17781120.
The previous prime is 18354389. The next prime is 18354433. The reversal of 18354421 is 12445381.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a 4-Lehmer number, since φ(18354421) divides (18354421-1)4.
It is a cyclic number.
It is not a de Polignac number, because 18354421 - 25 = 18354389 is a prime.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 18354421.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (18354451) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3781 + ... + 7141.
It is an arithmetic number, because the mean of its divisors is an integer number (2366848).
Almost surely, 218354421 is an apocalyptic number.
It is an amenable number.
18354421 is a deficient number, since it is larger than the sum of its proper divisors (580363).
18354421 is a wasteful number, since it uses less digits than its factorization.
18354421 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3531.
The product of its digits is 3840, while the sum is 28.
The square root of 18354421 is about 4284.2059941137. The cubic root of 18354421 is about 263.7830565846.
The spelling of 18354421 in words is "eighteen million, three hundred fifty-four thousand, four hundred twenty-one".
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