16243643 has 4 divisors (see below), whose sum is σ = 17493168. Its totient is φ = 14994120.

The previous prime is 16243609. The next prime is 16243649. The reversal of 16243643 is 34634261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34634261 = 89 ⋅389149.

It is a cyclic number.

It is not a de Polignac number, because 16243643 - 2¹⁰ = 16242619 is a prime.

It is a super-2 number, since 2×16243643² = 527711875822898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16243649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624743 + ... + 624768.

It is an arithmetic number, because the mean of its divisors is an integer number (4373292).

Almost surely, 2^16243643 is an apocalyptic number.

16243643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

16243643 is a deficient number, since it is larger than the sum of its proper divisors (1249525).

16243643 is a wasteful number, since it uses less digits than its factorization.

16243643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249524.

The product of its digits is 10368, while the sum is 29.

The square root of 16243643 is about 4030.3403082122. The cubic root of 16243643 is about 253.2568176506.

The spelling of 16243643 in words is "sixteen million, two hundred forty-three thousand, six hundred forty-three".