16290997 has 6 divisors (see below), whose sum is σ = 16464194. Its totient is φ = 16119600.

The previous prime is 16290979. The next prime is 16291007. The reversal of 16290997 is 79909261.

It can be written as a sum of positive squares in 3 ways, for example, as 8678916 + 7612081 = 2946^2 + 2759^2 .

It is a de Polignac number, because none of the positive numbers 2^k-16290997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16290907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9403 + ... + 10999.

Almost surely, 2^16290997 is an apocalyptic number.

It is an amenable number.

16290997 is a deficient number, since it is larger than the sum of its proper divisors (173197).

16290997 is an equidigital number, since it uses as much as digits as its factorization.

16290997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799 (or 1698 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 43.

The square root of 16290997 is about 4036.2107229430. The cubic root of 16290997 is about 253.5026797461.

The spelling of 16290997 in words is "sixteen million, two hundred ninety thousand, nine hundred ninety-seven".