16639420 has 36 divisors (see below), whose sum is σ = 40650120. Its totient is φ = 5704608.

The previous prime is 16639411. The next prime is 16639423. The reversal of 16639420 is 2493661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16639423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7510 + ... + 9469.

It is an arithmetic number, because the mean of its divisors is an integer number (1129170).

Almost surely, 2^16639420 is an apocalyptic number.

16639420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16639420 is an abundant number, since it is smaller than the sum of its proper divisors (24010700).

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

16639420 is a wasteful number, since it uses less digits than its factorization.

16639420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17002 (or 16993 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 16639420 is about 4079.1445181557. The cubic root of 16639420 is about 255.2972056920.

The spelling of 16639420 in words is "sixteen million, six hundred thirty-nine thousand, four hundred twenty".