223640042 has 4 divisors (see below), whose sum is σ = 335460066. Its totient is φ = 111820020.

The previous prime is 223640029. The next prime is 223640057. The reversal of 223640042 is 240046322.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 240046322 = 2 ⋅120023161.

It can be written as a sum of positive squares in only one way, i.e., 177928921 + 45711121 = 13339^2 + 6761^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55910009 + ... + 55910012.

Almost surely, 2^223640042 is an apocalyptic number.

223640042 is a deficient number, since it is larger than the sum of its proper divisors (111820024).

223640042 is a wasteful number, since it uses less digits than its factorization.

223640042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111820023.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 223640042 is about 14954.5993593944. The cubic root of 223640042 is about 606.9923091050.

Adding to 223640042 its reverse (240046322), we get a palindrome (463686364).

The spelling of 223640042 in words is "two hundred twenty-three million, six hundred forty thousand, forty-two".