16420638 has 32 divisors (see below), whose sum is σ = 36513792. Its totient is φ = 4888800.

The previous prime is 16420601. The next prime is 16420661. The reversal of 16420638 is 83602461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 978 + ... + 5813.

It is an arithmetic number, because the mean of its divisors is an integer number (1141056).

Almost surely, 2^16420638 is an apocalyptic number.

16420638 is an abundant number, since it is smaller than the sum of its proper divisors (20093154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16420638 is a wasteful number, since it uses less digits than its factorization.

16420638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6840.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 16420638 is about 4052.2386405541. The cubic root of 16420638 is about 254.1733476819.

It can be divided in two parts, 164 and 20638, that added together give a palindrome (20802).

The spelling of 16420638 in words is "sixteen million, four hundred twenty thousand, six hundred thirty-eight".