1423621 has 4 divisors (see below), whose sum is σ = 1443744. Its totient is φ = 1403500.

The previous prime is 1423607. The next prime is 1423627. The reversal of 1423621 is 1263241.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1263241 = 7 ⋅180463.

It is a cyclic number.

It is not a de Polignac number, because 1423621 - 2⁵ = 1423589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1423627) 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, 9955 + ... + 10096.

It is an arithmetic number, because the mean of its divisors is an integer number (360936).

2^1423621 is an apocalyptic number.

It is an amenable number.

1423621 is a deficient number, since it is larger than the sum of its proper divisors (20123).

1423621 is an equidigital number, since it uses as much as digits as its factorization.

1423621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20122.

The product of its digits is 288, while the sum is 19.

The square root of 1423621 is about 1193.1558992856. The cubic root of 1423621 is about 112.4945445914.

Adding to 1423621 its reverse (1263241), we get a palindrome (2686862).

The spelling of 1423621 in words is "one million, four hundred twenty-three thousand, six hundred twenty-one".