223520445 has 16 divisors (see below), whose sum is σ = 397369920. Its totient is φ = 119210832.

The previous prime is 223520443. The next prime is 223520449. The reversal of 223520445 is 544025322.

It is a happy number.

It is not a de Polignac number, because 223520445 - 2¹ = 223520443 is a prime.

It is a super-2 number, since 2×223520445² = 99922778665996050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223520443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 827719 + ... + 827988.

It is an arithmetic number, because the mean of its divisors is an integer number (24835620).

Almost surely, 2^223520445 is an apocalyptic number.

It is an amenable number.

223520445 is a deficient number, since it is larger than the sum of its proper divisors (173849475).

223520445 is a wasteful number, since it uses less digits than its factorization.

223520445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655721 (or 1655715 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

The square root of 223520445 is about 14950.6001551777. The cubic root of 223520445 is about 606.8840884677.

Adding to 223520445 its reverse (544025322), we get a palindrome (767545767).

The spelling of 223520445 in words is "two hundred twenty-three million, five hundred twenty thousand, four hundred forty-five".