1321438 has 4 divisors (see below), whose sum is σ = 1982160. Its totient is φ = 660718.

The previous prime is 1321429. The next prime is 1321447. The reversal of 1321438 is 8341231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8341231 = 47 ⋅177473.

It is an interprime number because it is at equal distance from previous prime (1321429) and next prime (1321447).

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 330358 + ... + 330361.

It is an arithmetic number, because the mean of its divisors is an integer number (495540).

2^1321438 is an apocalyptic number.

1321438 is a deficient number, since it is larger than the sum of its proper divisors (660722).

1321438 is an equidigital number, since it uses as much as digits as its factorization.

1321438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660721.

The product of its digits is 576, while the sum is 22.

The square root of 1321438 is about 1149.5381681354. The cubic root of 1321438 is about 109.7359506925.

Adding to 1321438 its reverse (8341231), we get a palindrome (9662669).

The spelling of 1321438 in words is "one million, three hundred twenty-one thousand, four hundred thirty-eight".