16671397 has 4 divisors (see below), whose sum is σ = 17209216. Its totient is φ = 16133580.

The previous prime is 16671377. The next prime is 16671427. The reversal of 16671397 is 79317661.

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 16671397 - 2⁷ = 16671269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16671377) 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, 268863 + ... + 268924.

It is an arithmetic number, because the mean of its divisors is an integer number (4302304).

Almost surely, 2^16671397 is an apocalyptic number.

It is an amenable number.

16671397 is a deficient number, since it is larger than the sum of its proper divisors (537819).

16671397 is an equidigital number, since it uses as much as digits as its factorization.

16671397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537818.

The product of its digits is 47628, while the sum is 40.

The square root of 16671397 is about 4083.0622086860. The cubic root of 16671397 is about 255.4606411723.

The spelling of 16671397 in words is "sixteen million, six hundred seventy-one thousand, three hundred ninety-seven".