16863641 has 4 divisors (see below), whose sum is σ = 16876800. Its totient is φ = 16850484.

The previous prime is 16863617. The next prime is 16863673. The reversal of 16863641 is 14636861.

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.

It is a cyclic number.

It is not a de Polignac number, because 16863641 - 2¹⁰ = 16862617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16863941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4421 + ... + 7298.

It is an arithmetic number, because the mean of its divisors is an integer number (4219200).

Almost surely, 2^16863641 is an apocalyptic number.

It is an amenable number.

16863641 is a deficient number, since it is larger than the sum of its proper divisors (13159).

16863641 is a wasteful number, since it uses less digits than its factorization.

16863641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13158.

The product of its digits is 20736, while the sum is 35.

The square root of 16863641 is about 4106.5363750976. The cubic root of 16863641 is about 256.4388276264.

The spelling of 16863641 in words is "sixteen million, eight hundred sixty-three thousand, six hundred forty-one".