16397851 has 4 divisors (see below), whose sum is σ = 16548400. Its totient is φ = 16247304.

The previous prime is 16397839. The next prime is 16397867. The reversal of 16397851 is 15879361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15879361 = 23 ⋅690407.

It is a cyclic number.

It is not a de Polignac number, because 16397851 - 2¹⁷ = 16266779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16397831) 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, 75111 + ... + 75328.

It is an arithmetic number, because the mean of its divisors is an integer number (4137100).

Almost surely, 2^16397851 is an apocalyptic number.

16397851 is a deficient number, since it is larger than the sum of its proper divisors (150549).

16397851 is a wasteful number, since it uses less digits than its factorization.

16397851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150548.

The product of its digits is 45360, while the sum is 40.

The square root of 16397851 is about 4049.4260087079. The cubic root of 16397851 is about 254.0557207203.

The spelling of 16397851 in words is "sixteen million, three hundred ninety-seven thousand, eight hundred fifty-one".