16388425 has 12 divisors (see below), whose sum is σ = 21517596. Its totient is φ = 12339200.

The previous prime is 16388419. The next prime is 16388467. The reversal of 16388425 is 52488361.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 300304 + 16088121 = 548^2 + 4011^2 .

It is not a de Polignac number, because 16388425 - 2³ = 16388417 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18856 + ... + 19705.

It is an arithmetic number, because the mean of its divisors is an integer number (1793133).

Almost surely, 2^16388425 is an apocalyptic number.

It is an amenable number.

16388425 is a deficient number, since it is larger than the sum of its proper divisors (5129171).

16388425 is a wasteful number, since it uses less digits than its factorization.

16388425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38588 (or 38583 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 16388425 is about 4048.2619727483. The cubic root of 16388425 is about 254.0070316527.

It can be divided in two parts, 163 and 88425, that added together give a palindrome (88588).

The spelling of 16388425 in words is "sixteen million, three hundred eighty-eight thousand, four hundred twenty-five".