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16198021 = 72314003
BaseRepresentation
bin111101110010…
…100110000101
31010110221111201
4331302212011
513121314041
61335102501
7254452360
oct75624605
933427451
1016198021
1191638a4
125511a31
133481a38
1422190d7
15164e631
hexf72985

16198021 has 4 divisors (see below), whose sum is σ = 18512032. Its totient is φ = 13884012.

The previous prime is 16197989. The next prime is 16198069. The reversal of 16198021 is 12089161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12089161 = 71727023.

It is a cyclic number.

It is not a de Polignac number, because 16198021 - 25 = 16197989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16196021) 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 3 ways as a sum of consecutive naturals, for example, 1156995 + ... + 1157008.

It is an arithmetic number, because the mean of its divisors is an integer number (4628008).

Almost surely, 216198021 is an apocalyptic number.

It is an amenable number.

16198021 is a deficient number, since it is larger than the sum of its proper divisors (2314011).

16198021 is an equidigital number, since it uses as much as digits as its factorization.

16198021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2314010.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 16198021 is about 4024.6765087396. The cubic root of 16198021 is about 253.0194957558.

The spelling of 16198021 in words is "sixteen million, one hundred ninety-eight thousand, twenty-one".

Divisors: 1 7 2314003 16198021