16388642 has 8 divisors (see below), whose sum is σ = 24600576. Its totient is φ = 8188452.

The previous prime is 16388641. The next prime is 16388681. The reversal of 16388642 is 24688361.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 16388596 and 16388605.

It is not an unprimeable number, because it can be changed into a prime (16388641) 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, 2783 + ... + 6365.

It is an arithmetic number, because the mean of its divisors is an integer number (3075072).

Almost surely, 2^16388642 is an apocalyptic number.

16388642 is a deficient number, since it is larger than the sum of its proper divisors (8211934).

16388642 is a wasteful number, since it uses less digits than its factorization.

16388642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5872.

The product of its digits is 55296, while the sum is 38.

The square root of 16388642 is about 4048.2887742848. The cubic root of 16388642 is about 254.0081527546.

The spelling of 16388642 in words is "sixteen million, three hundred eighty-eight thousand, six hundred forty-two".