16421868 has 36 divisors (see below), whose sum is σ = 41670720. Its totient is φ = 5452896.

The previous prime is 16421863. The next prime is 16421879. The reversal of 16421868 is 86812461.

16421868 is a `hidden beast` number, since 1 + 642 + 1 + 8 + 6 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (16421863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10693 + ... + 12131.

It is an arithmetic number, because the mean of its divisors is an integer number (1157520).

Almost surely, 2^16421868 is an apocalyptic number.

16421868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

16421868 is an abundant number, since it is smaller than the sum of its proper divisors (25248852).

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

16421868 is a wasteful number, since it uses less digits than its factorization.

16421868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1766 (or 1761 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 16421868 is about 4052.3904056742. The cubic root of 16421868 is about 254.1796938708.

The spelling of 16421868 in words is "sixteen million, four hundred twenty-one thousand, eight hundred sixty-eight".