16378669 has 4 divisors (see below), whose sum is σ = 16386844. Its totient is φ = 16370496.

The previous prime is 16378613. The next prime is 16378673. The reversal of 16378669 is 96687361.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 96687361 = 5519 ⋅17519.

It can be written as a sum of positive squares in 2 ways, for example, as 9424900 + 6953769 = 3070^2 + 2637^2 .

It is a cyclic number.

It is not a de Polignac number, because 16378669 - 2¹³ = 16370477 is a prime.

It is a super-2 number, since 2×16378669² = 536521596423122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16378469) 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, 1189 + ... + 5845.

It is an arithmetic number, because the mean of its divisors is an integer number (4096711).

Almost surely, 2^16378669 is an apocalyptic number.

It is an amenable number.

16378669 is a deficient number, since it is larger than the sum of its proper divisors (8175).

16378669 is an equidigital number, since it uses as much as digits as its factorization.

16378669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8174.

The product of its digits is 326592, while the sum is 46.

The square root of 16378669 is about 4047.0568318224. The cubic root of 16378669 is about 253.9566183377.

The spelling of 16378669 in words is "sixteen million, three hundred seventy-eight thousand, six hundred sixty-nine".