16421660 has 24 divisors (see below), whose sum is σ = 36514800. Its totient is φ = 6182144.

The previous prime is 16421623. The next prime is 16421683. The reversal of 16421660 is 6612461.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23810 + ... + 24489.

It is an arithmetic number, because the mean of its divisors is an integer number (1521450).

Almost surely, 2^16421660 is an apocalyptic number.

16421660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16421660 is an abundant number, since it is smaller than the sum of its proper divisors (20093140).

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

16421660 is a wasteful number, since it uses less digits than its factorization.

16421660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48325 (or 48323 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 16421660 is about 4052.3647417280. The cubic root of 16421660 is about 254.1786207164.

The spelling of 16421660 in words is "sixteen million, four hundred twenty-one thousand, six hundred sixty".