1421839 has 4 divisors (see below), whose sum is σ = 1456560. Its totient is φ = 1387120.

The previous prime is 1421813. The next prime is 1421857. The reversal of 1421839 is 9381241.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9381241 = 83 ⋅113027.

It is a cyclic number.

It is not a de Polignac number, because 1421839 - 2⁷ = 1421711 is a prime.

It is a super-2 number, since 2×1421839² = 4043252283842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421039) 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, 17299 + ... + 17380.

It is an arithmetic number, because the mean of its divisors is an integer number (364140).

2^1421839 is an apocalyptic number.

1421839 is a deficient number, since it is larger than the sum of its proper divisors (34721).

1421839 is an equidigital number, since it uses as much as digits as its factorization.

1421839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34720.

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

The square root of 1421839 is about 1192.4089063740. The cubic root of 1421839 is about 112.4475871077.

The spelling of 1421839 in words is "one million, four hundred twenty-one thousand, eight hundred thirty-nine".