16477997 has 4 divisors (see below), whose sum is σ = 17345280. Its totient is φ = 15610716.

The previous prime is 16477973. The next prime is 16478009. The reversal of 16477997 is 79977461.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79977461 = 37 ⋅2161553.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16477997 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 (16477297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 433613 + ... + 433650.

It is an arithmetic number, because the mean of its divisors is an integer number (4336320).

Almost surely, 2^16477997 is an apocalyptic number.

It is an amenable number.

16477997 is a deficient number, since it is larger than the sum of its proper divisors (867283).

16477997 is an equidigital number, since it uses as much as digits as its factorization.

16477997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867282.

The product of its digits is 666792, while the sum is 50.

The square root of 16477997 is about 4059.3099167223. The cubic root of 16477997 is about 254.4689550845.

The spelling of 16477997 in words is "sixteen million, four hundred seventy-seven thousand, nine hundred ninety-seven".