4021893 has 18 divisors (see below), whose sum is σ = 6042374. Its totient is φ = 2676888.

The previous prime is 4021891. The next prime is 4021903. The reversal of 4021893 is 3981204.

It can be written as a sum of positive squares in only one way, i.e., 2125764 + 1896129 = 1458^2 + 1377^2 .

It is not a de Polignac number, because 4021893 - 2¹ = 4021891 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

4021893 is a lucky number.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021891) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 6255 + ... + 6867.

Almost surely, 2^4021893 is an apocalyptic number.

It is an amenable number.

4021893 is a deficient number, since it is larger than the sum of its proper divisors (2020481).

4021893 is an frugal number, since it uses more digits than its factorization.

4021893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637 (or 616 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 4021893 is about 2005.4657813087. The cubic root of 4021893 is about 159.0291865253.

The spelling of 4021893 in words is "four million, twenty-one thousand, eight hundred ninety-three".