423640456 has 8 divisors (see below), whose sum is σ = 794325870. Its totient is φ = 211820224.

The previous prime is 423640453. The next prime is 423640471. The reversal of 423640456 is 654046324.

It can be written as a sum of positive squares in only one way, i.e., 229037956 + 194602500 = 15134^2 + 13950^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (423640453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26477521 + ... + 26477536.

Almost surely, 2^423640456 is an apocalyptic number.

It is an amenable number.

423640456 is a deficient number, since it is larger than the sum of its proper divisors (370685414).

423640456 is a wasteful number, since it uses less digits than its factorization.

423640456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52955063 (or 52955059 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 34.

The square root of 423640456 is about 20582.5279302616. The cubic root of 423640456 is about 751.0447401631.

The spelling of 423640456 in words is "four hundred twenty-three million, six hundred forty thousand, four hundred fifty-six".