16257997 has 4 divisors (see below), whose sum is σ = 18580576. Its totient is φ = 13935420.

The previous prime is 16257973. The next prime is 16258007. The reversal of 16257997 is 79975261.

It is a happy number.

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 16257997 - 2¹¹ = 16255949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16257907) 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 3 ways as a sum of consecutive naturals, for example, 1161279 + ... + 1161292.

It is an arithmetic number, because the mean of its divisors is an integer number (4645144).

Almost surely, 2^16257997 is an apocalyptic number.

It is an amenable number.

16257997 is a deficient number, since it is larger than the sum of its proper divisors (2322579).

16257997 is an equidigital number, since it uses as much as digits as its factorization.

16257997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2322578.

The product of its digits is 238140, while the sum is 46.

The square root of 16257997 is about 4032.1206579169. The cubic root of 16257997 is about 253.3313940679.

The spelling of 16257997 in words is "sixteen million, two hundred fifty-seven thousand, nine hundred ninety-seven".