423440644 has 24 divisors (see below), whose sum is σ = 808911936. Its totient is φ = 192348000.

The previous prime is 423440621. The next prime is 423440657. The reversal of 423440644 is 446044324.

It is a happy number.

It is a super-2 number, since 2×423440644² = 358603957982269472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118849 + ... + 122359.

It is an arithmetic number, because the mean of its divisors is an integer number (33704664).

Almost surely, 2^423440644 is an apocalyptic number.

423440644 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

423440644 is a deficient number, since it is larger than the sum of its proper divisors (385471292).

423440644 is a wasteful number, since it uses less digits than its factorization.

423440644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6267 (or 6265 counting only the distinct ones).

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

The square root of 423440644 is about 20577.6734350606. The cubic root of 423440644 is about 750.9266436742.

Adding to 423440644 its reverse (446044324), we get a palindrome (869484968).

The spelling of 423440644 in words is "four hundred twenty-three million, four hundred forty thousand, six hundred forty-four".