16303997 has 4 divisors (see below), whose sum is σ = 16315740. Its totient is φ = 16292256.

The previous prime is 16303949. The next prime is 16304017. The reversal of 16303997 is 79930361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14830201 + 1473796 = 3851^2 + 1214^2 .

It is a cyclic number.

It is not a de Polignac number, because 16303997 - 2⁸ = 16303741 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 16303997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16303907) 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, 3458 + ... + 6675.

It is an arithmetic number, because the mean of its divisors is an integer number (4078935).

Almost surely, 2^16303997 is an apocalyptic number.

It is an amenable number.

16303997 is a deficient number, since it is larger than the sum of its proper divisors (11743).

16303997 is a wasteful number, since it uses less digits than its factorization.

16303997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11742.

The product of its (nonzero) digits is 30618, while the sum is 38.

The square root of 16303997 is about 4037.8208231669. The cubic root of 16303997 is about 253.5700924123.

The spelling of 16303997 in words is "sixteen million, three hundred three thousand, nine hundred ninety-seven".