223969657 has 4 divisors (see below), whose sum is σ = 226486260. Its totient is φ = 221453056.

The previous prime is 223969643. The next prime is 223969667. The reversal of 223969657 is 756969322.

223969657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 756969322 = 2 ⋅378484661.

It can be written as a sum of positive squares in 2 ways, for example, as 138203536 + 85766121 = 11756^2 + 9261^2 .

It is a cyclic number.

It is not a de Polignac number, because 223969657 - 2²⁷ = 89751929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 223969657.

It is not an unprimeable number, because it can be changed into a prime (223969667) 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, 1258168 + ... + 1258345.

It is an arithmetic number, because the mean of its divisors is an integer number (56621565).

Almost surely, 2^223969657 is an apocalyptic number.

It is an amenable number.

223969657 is a deficient number, since it is larger than the sum of its proper divisors (2516603).

223969657 is an equidigital number, since it uses as much as digits as its factorization.

223969657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2516602.

The product of its digits is 1224720, while the sum is 49.

The square root of 223969657 is about 14965.6158242820. The cubic root of 223969657 is about 607.2903707502.

The spelling of 223969657 in words is "two hundred twenty-three million, nine hundred sixty-nine thousand, six hundred fifty-seven".