1839421 has 4 divisors (see below), whose sum is σ = 1842912. Its totient is φ = 1835932.

The previous prime is 1839413. The next prime is 1839427. The reversal of 1839421 is 1249381.

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 1839421 - 2³ = 1839413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1839421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1839427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 775 + ... + 2068.

It is an arithmetic number, because the mean of its divisors is an integer number (460728).

2^1839421 is an apocalyptic number.

It is an amenable number.

1839421 is a deficient number, since it is larger than the sum of its proper divisors (3491).

1839421 is an equidigital number, since it uses as much as digits as its factorization.

1839421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3490.

The product of its digits is 1728, while the sum is 28.

The square root of 1839421 is about 1356.2525576013. The cubic root of 1839421 is about 122.5256589316.

It can be divided in two parts, 183 and 9421, that added together give a square (9604 = 98²).

The spelling of 1839421 in words is "one million, eight hundred thirty-nine thousand, four hundred twenty-one".