1223641 has 4 divisors (see below), whose sum is σ = 1231312. Its totient is φ = 1215972.

The previous prime is 1223633. The next prime is 1223683. The reversal of 1223641 is 1463221.

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 1223641 - 2³ = 1223633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223941) 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, 3591 + ... + 3916.

It is an arithmetic number, because the mean of its divisors is an integer number (307828).

2^1223641 is an apocalyptic number.

It is an amenable number.

1223641 is a deficient number, since it is larger than the sum of its proper divisors (7671).

1223641 is an equidigital number, since it uses as much as digits as its factorization.

1223641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7670.

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

The square root of 1223641 is about 1106.1830770718. The cubic root of 1223641 is about 106.9591657152.

Adding to 1223641 its reverse (1463221), we get a palindrome (2686862).

It can be divided in two parts, 12 and 23641, that added together give a triangular number (23653 = T₂₁₇).

The spelling of 1223641 in words is "one million, two hundred twenty-three thousand, six hundred forty-one".