2223649 has 4 divisors (see below), whose sum is σ = 2255040. Its totient is φ = 2192260.

The previous prime is 2223631. The next prime is 2223671. The reversal of 2223649 is 9463222.

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 2223649 - 2⁷ = 2223521 is a prime.

It is a super-2 number, since 2×2223649² = 9889229750402, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2223679) 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, 15589 + ... + 15730.

It is an arithmetic number, because the mean of its divisors is an integer number (563760).

2^2223649 is an apocalyptic number.

It is an amenable number.

2223649 is a deficient number, since it is larger than the sum of its proper divisors (31391).

2223649 is an equidigital number, since it uses as much as digits as its factorization.

2223649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31390.

The product of its digits is 5184, while the sum is 28.

The square root of 2223649 is about 1491.1904640253. The cubic root of 2223649 is about 130.5235102948.

The spelling of 2223649 in words is "two million, two hundred twenty-three thousand, six hundred forty-nine".