16487997 has 4 divisors (see below), whose sum is σ = 21984000. Its totient is φ = 10991996.

The previous prime is 16487971. The next prime is 16488007. The reversal of 16487997 is 79978461.

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 16487997 - 2¹⁹ = 15963709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16487927) 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, 2747997 + ... + 2748002.

It is an arithmetic number, because the mean of its divisors is an integer number (5496000).

Almost surely, 2^16487997 is an apocalyptic number.

It is an amenable number.

16487997 is a deficient number, since it is larger than the sum of its proper divisors (5496003).

16487997 is an equidigital number, since it uses as much as digits as its factorization.

16487997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5496002.

The product of its digits is 762048, while the sum is 51.

The square root of 16487997 is about 4060.5414663564. The cubic root of 16487997 is about 254.5204211892.

The spelling of 16487997 in words is "sixteen million, four hundred eighty-seven thousand, nine hundred ninety-seven".