1624421 has 4 divisors (see below), whose sum is σ = 1695072. Its totient is φ = 1553772.

The previous prime is 1624417. The next prime is 1624423. The reversal of 1624421 is 1244261.

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 1624421 - 2² = 1624417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1624393 and 1624402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1624423) 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, 35291 + ... + 35336.

It is an arithmetic number, because the mean of its divisors is an integer number (423768).

2^1624421 is an apocalyptic number.

It is an amenable number.

1624421 is a deficient number, since it is larger than the sum of its proper divisors (70651).

1624421 is an equidigital number, since it uses as much as digits as its factorization.

1624421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70650.

The product of its digits is 384, while the sum is 20.

The square root of 1624421 is about 1274.5277556805. The cubic root of 1624421 is about 117.5527694167.

Adding to 1624421 its reverse (1244261), we get a palindrome (2868682).

The spelling of 1624421 in words is "one million, six hundred twenty-four thousand, four hundred twenty-one".