16863997 has 8 divisors (see below), whose sum is σ = 17334072. Its totient is φ = 16396800.

The previous prime is 16863989. The next prime is 16864013. The reversal of 16863997 is 79936861.

It can be written as a sum of positive squares in 4 ways, for example, as 4761 + 16859236 = 69^2 + 4106^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16863997 - 2³ = 16863989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16863997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16863797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16773 + ... + 17749.

It is an arithmetic number, because the mean of its divisors is an integer number (2166759).

Almost surely, 2^16863997 is an apocalyptic number.

It is an amenable number.

16863997 is a deficient number, since it is larger than the sum of its proper divisors (470075).

16863997 is an equidigital number, since it uses as much as digits as its factorization.

16863997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439.

The product of its digits is 489888, while the sum is 49.

The square root of 16863997 is about 4106.5797203999. The cubic root of 16863997 is about 256.4406321316.

The spelling of 16863997 in words is "sixteen million, eight hundred sixty-three thousand, nine hundred ninety-seven".