1896021 has 8 divisors (see below), whose sum is σ = 2808960. Its totient is φ = 1263996.

The previous prime is 1896019. The next prime is 1896023. The reversal of 1896021 is 1206981.

It is an interprime number because it is at equal distance from previous prime (1896019) and next prime (1896023).

It is not a de Polignac number, because 1896021 - 2¹ = 1896019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 70223 = 1896021 / (1 + 8 + 9 + 6 + 0 + 2 + 1).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1896023) 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 7 ways as a sum of consecutive naturals, for example, 35085 + ... + 35138.

It is an arithmetic number, because the mean of its divisors is an integer number (351120).

2^1896021 is an apocalyptic number.

It is an amenable number.

1896021 is a deficient number, since it is larger than the sum of its proper divisors (912939).

1896021 is an equidigital number, since it uses as much as digits as its factorization.

1896021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70232 (or 70226 counting only the distinct ones).

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

The square root of 1896021 is about 1376.9607837553. The cubic root of 1896021 is about 123.7697121950.

It can be divided in two parts, 18960 and 21, that added together give a palindrome (18981).

The spelling of 1896021 in words is "one million, eight hundred ninety-six thousand, twenty-one".