16243864 has 64 divisors (see below), whose sum is σ = 38283840. Its totient is φ = 6289920.

The previous prime is 16243861. The next prime is 16243867. The reversal of 16243864 is 46834261.

It is an interprime number because it is at equal distance from previous prime (16243861) and next prime (16243867).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16243861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38374 + ... + 38794.

It is an arithmetic number, because the mean of its divisors is an integer number (598185).

Almost surely, 2^16243864 is an apocalyptic number.

16243864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16243864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19141920).

16243864 is an abundant number, since it is smaller than the sum of its proper divisors (22039976).

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

16243864 is a wasteful number, since it uses less digits than its factorization.

16243864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500 (or 496 counting only the distinct ones).

The product of its digits is 27648, while the sum is 34.

The square root of 16243864 is about 4030.3677251586. The cubic root of 16243864 is about 253.2579661922.

The spelling of 16243864 in words is "sixteen million, two hundred forty-three thousand, eight hundred sixty-four".