1304638 has 4 divisors (see below), whose sum is σ = 1956960. Its totient is φ = 652318.

The previous prime is 1304627. The next prime is 1304659. The reversal of 1304638 is 8364031.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×1304638² = 3404160622088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326158 + ... + 326161.

It is an arithmetic number, because the mean of its divisors is an integer number (489240).

2^1304638 is an apocalyptic number.

1304638 is a deficient number, since it is larger than the sum of its proper divisors (652322).

1304638 is an equidigital number, since it uses as much as digits as its factorization.

1304638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652321.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 1304638 is about 1142.2075117946. The cubic root of 1304638 is about 109.2689260587.

Adding to 1304638 its reverse (8364031), we get a palindrome (9668669).

The spelling of 1304638 in words is "one million, three hundred four thousand, six hundred thirty-eight".