16554397 has 4 divisors (see below), whose sum is σ = 16835040. Its totient is φ = 16273756.

The previous prime is 16554383. The next prime is 16554401. The reversal of 16554397 is 79345561.

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: 79345561 = 23 ⋅3449807.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16554397 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16554337) 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, 140233 + ... + 140350.

It is an arithmetic number, because the mean of its divisors is an integer number (4208760).

Almost surely, 2^16554397 is an apocalyptic number.

It is an amenable number.

16554397 is a deficient number, since it is larger than the sum of its proper divisors (280643).

16554397 is an equidigital number, since it uses as much as digits as its factorization.

16554397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280642.

The product of its digits is 113400, while the sum is 40.

The square root of 16554397 is about 4068.7095005665. The cubic root of 16554397 is about 254.8616294022.

The spelling of 16554397 in words is "sixteen million, five hundred fifty-four thousand, three hundred ninety-seven".