1869421 has 4 divisors (see below), whose sum is σ = 1875744. Its totient is φ = 1863100.

The previous prime is 1869419. The next prime is 1869433. The reversal of 1869421 is 1249681.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1869421 - 2¹ = 1869419 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1869221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2695 + ... + 3316.

It is an arithmetic number, because the mean of its divisors is an integer number (468936).

2^1869421 is an apocalyptic number.

It is an amenable number.

1869421 is a deficient number, since it is larger than the sum of its proper divisors (6323).

1869421 is an equidigital number, since it uses as much as digits as its factorization.

1869421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6322.

The product of its digits is 3456, while the sum is 31.

The square root of 1869421 is about 1367.2677133612. The cubic root of 1869421 is about 123.1881800166.

The spelling of 1869421 in words is "one million, eight hundred sixty-nine thousand, four hundred twenty-one".