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1816428 = 223229661
BaseRepresentation
bin110111011011101101100
310102021200010
412323131230
5431111203
6102533220
721303465
oct6733554
93367603
101816428
111030789
12737210
134b7a13
14353d6c
1525d303
hex1bb76c

1816428 has 24 divisors (see below), whose sum is σ = 4263280. Its totient is φ = 601920.

The previous prime is 1816421. The next prime is 1816429. The reversal of 1816428 is 8246181.

It is a super-4 number, since 4×18164284 (a number of 26 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1816395 and 1816404.

It is not an unprimeable number, because it can be changed into a prime (1816421) 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, 2418 + ... + 3078.

21816428 is an apocalyptic number.

It is an amenable number.

1816428 is an abundant number, since it is smaller than the sum of its proper divisors (2446852).

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

1816428 is a wasteful number, since it uses less digits than its factorization.

1816428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897 (or 895 counting only the distinct ones).

The product of its digits is 3072, while the sum is 30.

The square root of 1816428 is about 1347.7492348356. The cubic root of 1816428 is about 122.0129879571.

The spelling of 1816428 in words is "one million, eight hundred sixteen thousand, four hundred twenty-eight".

Divisors: 1 2 3 4 6 12 229 458 661 687 916 1322 1374 1983 2644 2748 3966 7932 151369 302738 454107 605476 908214 1816428