16378505 has 16 divisors (see below), whose sum is σ = 23091264. Its totient is φ = 10994880.

The previous prime is 16378501. The next prime is 16378511. The reversal of 16378505 is 50587361.

It is not a de Polignac number, because 16378505 - 2² = 16378501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16378501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10739 + ... + 12168.

It is an arithmetic number, because the mean of its divisors is an integer number (1443204).

Almost surely, 2^16378505 is an apocalyptic number.

It is an amenable number.

16378505 is a deficient number, since it is larger than the sum of its proper divisors (6712759).

16378505 is a wasteful number, since it uses less digits than its factorization.

16378505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22936.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 16378505 is about 4047.0365701338. The cubic root of 16378505 is about 253.9557707103.

Subtracting 16378505 from its reverse (50587361), we obtain a triangular number (34208856 = T₈₂₇₁).

The spelling of 16378505 in words is "sixteen million, three hundred seventy-eight thousand, five hundred five".