16003890 has 144 divisors (see below), whose sum is σ = 51217920. Its totient is φ = 3447360.

The previous prime is 16003859. The next prime is 16003903. The reversal of 16003890 is 9830061.

16003890 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×16003890² = 512248990264200, which contains 22 as substring.

16003890 is strictly pandigital in base 8.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 83695 + ... + 83885.

It is an arithmetic number, because the mean of its divisors is an integer number (355680).

Almost surely, 2^16003890 is an apocalyptic number.

16003890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16003890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25608960).

16003890 is an abundant number, since it is smaller than the sum of its proper divisors (35214030).

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

16003890 is a wasteful number, since it uses less digits than its factorization.

16003890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 16003890 is about 4000.4862204487. The cubic root of 16003890 is about 252.0046295446.

The spelling of 16003890 in words is "sixteen million, three thousand, eight hundred ninety".