16021890 has 24 divisors (see below), whose sum is σ = 41657148. Its totient is φ = 4272480.

The previous prime is 16021879. The next prime is 16021897. The reversal of 16021890 is 9812061.

16021890 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 15944049 + 77841 = 3993^2 + 279^2 .

It is not an unprimeable number, because it can be changed into a prime (16021897) 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, 88921 + ... + 89100.

Almost surely, 2^16021890 is an apocalyptic number.

16021890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16021890 is an abundant number, since it is smaller than the sum of its proper divisors (25635258).

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

16021890 is a wasteful number, since it uses less digits than its factorization.

16021890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178034 (or 178031 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 16021890 is about 4002.7353147566. The cubic root of 16021890 is about 252.0990729117.

The spelling of 16021890 in words is "sixteen million, twenty-one thousand, eight hundred ninety".