16378491 has 4 divisors (see below), whose sum is σ = 21837992. Its totient is φ = 10918992.

The previous prime is 16378489. The next prime is 16378501. The reversal of 16378491 is 19487361.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 16378491 - 2¹ = 16378489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16378421) 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, 2729746 + ... + 2729751.

It is an arithmetic number, because the mean of its divisors is an integer number (5459498).

Almost surely, 2^16378491 is an apocalyptic number.

16378491 is a deficient number, since it is larger than the sum of its proper divisors (5459501).

16378491 is an equidigital number, since it uses as much as digits as its factorization.

16378491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5459500.

The product of its digits is 36288, while the sum is 39.

The square root of 16378491 is about 4047.0348404727. The cubic root of 16378491 is about 253.9556983516.

The spelling of 16378491 in words is "sixteen million, three hundred seventy-eight thousand, four hundred ninety-one".