223387729 has 4 divisors (see below), whose sum is σ = 224237376. Its totient is φ = 222538084.

The previous prime is 223387699. The next prime is 223387771. The reversal of 223387729 is 927783322.

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: 927783322 = 2 ⋅463891661.

It is a cyclic number.

It is not a de Polignac number, because 223387729 - 2⁷ = 223387601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (223397729) 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, 424429 + ... + 424954.

It is an arithmetic number, because the mean of its divisors is an integer number (56059344).

Almost surely, 2^223387729 is an apocalyptic number.

It is an amenable number.

223387729 is a deficient number, since it is larger than the sum of its proper divisors (849647).

223387729 is an equidigital number, since it uses as much as digits as its factorization.

223387729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849646.

The product of its digits is 254016, while the sum is 43.

The square root of 223387729 is about 14946.1610121128. The cubic root of 223387729 is about 606.7639515456.

The spelling of 223387729 in words is "two hundred twenty-three million, three hundred eighty-seven thousand, seven hundred twenty-nine".