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16540489 = 74832
BaseRepresentation
bin111111000110…
…001101001001
31011010100021201
4333012031021
513213243424
61350304201
7260410000
oct77061511
934110251
1016540489
119378129
125658061
133571894
1422a7c37
1516bad44
hexfc6349

16540489 has 15 divisors (see below), whose sum is σ = 19531373. Its totient is φ = 14006748.

The previous prime is 16540483. The next prime is 16540493. The reversal of 16540489 is 98404561.

It is a happy number.

The square root of 16540489 is 4067.

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

It is not a de Polignac number, because 16540489 - 23 = 16540481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16540481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 199242 + ... + 199324.

Almost surely, 216540489 is an apocalyptic number.

16540489 is the 4067-th square number.

16540489 is the 2034-th centered octagonal number.

It is an amenable number.

16540489 is a deficient number, since it is larger than the sum of its proper divisors (2990884).

16540489 is an frugal number, since it uses more digits than its factorization.

16540489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The cubic root of 16540489 is about 254.7902363123.

The spelling of 16540489 in words is "sixteen million, five hundred forty thousand, four hundred eighty-nine".

Divisors: 1 7 49 83 343 581 2401 4067 6889 28469 48223 199283 337561 2362927 16540489