423404644 has 12 divisors (see below), whose sum is σ = 797955004. Its totient is φ = 195417504.

The previous prime is 423404633. The next prime is 423404659. The reversal of 423404644 is 446404324.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 37675044 + 385729600 = 6138^2 + 19640^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4071147 + ... + 4071250.

Almost surely, 2^423404644 is an apocalyptic number.

It is an amenable number.

423404644 is a deficient number, since it is larger than the sum of its proper divisors (374550360).

423404644 is a wasteful number, since it uses less digits than its factorization.

423404644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8142414 (or 8142412 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 31.

The square root of 423404644 is about 20576.7986820108. The cubic root of 423404644 is about 750.9053623559.

Adding to 423404644 its reverse (446404324), we get a palindrome (869808968).

The spelling of 423404644 in words is "four hundred twenty-three million, four hundred four thousand, six hundred forty-four".