16378825 has 12 divisors (see below), whose sum is σ = 20450700. Its totient is φ = 13012160.

The previous prime is 16378807. The next prime is 16378849. The reversal of 16378825 is 52887361.

It can be written as a sum of positive squares in 6 ways, for example, as 2143296 + 14235529 = 1464^2 + 3773^2 .

It is not a de Polignac number, because 16378825 - 2¹³ = 16370633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1527 + ... + 5923.

It is an arithmetic number, because the mean of its divisors is an integer number (1704225).

Almost surely, 2^16378825 is an apocalyptic number.

It is an amenable number.

16378825 is a deficient number, since it is larger than the sum of its proper divisors (4071875).

16378825 is a wasteful number, since it uses less digits than its factorization.

16378825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4556 (or 4551 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The square root of 16378825 is about 4047.0761050418. The cubic root of 16378825 is about 253.9574246121.

The spelling of 16378825 in words is "sixteen million, three hundred seventy-eight thousand, eight hundred twenty-five".