16506379 has 4 divisors (see below), whose sum is σ = 16519360. Its totient is φ = 16493400.

The previous prime is 16506377. The next prime is 16506397. The reversal of 16506379 is 97360561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97360561 = 59 ⋅1650179.

It is a cyclic number.

It is not a de Polignac number, because 16506379 - 2¹ = 16506377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16506377) 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, 4347 + ... + 7204.

It is an arithmetic number, because the mean of its divisors is an integer number (4129840).

Almost surely, 2^16506379 is an apocalyptic number.

16506379 is a deficient number, since it is larger than the sum of its proper divisors (12981).

16506379 is a wasteful number, since it uses less digits than its factorization.

16506379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12980.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 16506379 is about 4062.8043270628. The cubic root of 16506379 is about 254.6149719258.

The spelling of 16506379 in words is "sixteen million, five hundred six thousand, three hundred seventy-nine".