423215540 has 24 divisors (see below), whose sum is σ = 969548832. Its totient is φ = 153896480.

The previous prime is 423215539. The next prime is 423215549. The reversal of 423215540 is 45512324.

It is a happy number.

It is a super-2 number, since 2×423215540² = 358222786594983200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423215549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 961634 + ... + 962073.

It is an arithmetic number, because the mean of its divisors is an integer number (40397868).

Almost surely, 2^423215540 is an apocalyptic number.

It is an amenable number.

423215540 is an abundant number, since it is smaller than the sum of its proper divisors (546333292).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

423215540 is a wasteful number, since it uses less digits than its factorization.

423215540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1923727 (or 1923725 counting only the distinct ones).

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

The square root of 423215540 is about 20572.2030905783. The cubic root of 423215540 is about 750.7935541404.

Adding to 423215540 its reverse (45512324), we get a palindrome (468727864).

The spelling of 423215540 in words is "four hundred twenty-three million, two hundred fifteen thousand, five hundred forty".