423540215 has 24 divisors (see below), whose sum is σ = 601617120. Its totient is φ = 280393344.

The previous prime is 423540211. The next prime is 423540241. The reversal of 423540215 is 512045324.

It is a happy number.

It is not a de Polignac number, because 423540215 - 2² = 423540211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423540211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22241 + ... + 36629.

It is an arithmetic number, because the mean of its divisors is an integer number (25067380).

Almost surely, 2^423540215 is an apocalyptic number.

423540215 is a deficient number, since it is larger than the sum of its proper divisors (178076905).

423540215 is a wasteful number, since it uses less digits than its factorization.

423540215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14459 (or 14430 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 423540215 is about 20580.0926868661. The cubic root of 423540215 is about 750.9854985637.

Adding to 423540215 its reverse (512045324), we get a palindrome (935585539).

The spelling of 423540215 in words is "four hundred twenty-three million, five hundred forty thousand, two hundred fifteen".