423656641 has 4 divisors (see below), whose sum is σ = 425506900. Its totient is φ = 421806384.

The previous prime is 423656593. The next prime is 423656647. The reversal of 423656641 is 146656324.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 258277041 + 165379600 = 16071^2 + 12860^2 .

It is a cyclic number.

It is not a de Polignac number, because 423656641 - 2¹¹ = 423654593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 423656641.

It is not an unprimeable number, because it can be changed into a prime (423656647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 924786 + ... + 925243.

It is an arithmetic number, because the mean of its divisors is an integer number (106376725).

Almost surely, 2^423656641 is an apocalyptic number.

It is an amenable number.

423656641 is a deficient number, since it is larger than the sum of its proper divisors (1850259).

423656641 is a wasteful number, since it uses less digits than its factorization.

423656641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1850258.

The product of its digits is 103680, while the sum is 37.

The square root of 423656641 is about 20582.9210997856. The cubic root of 423656641 is about 751.0543044875.

The spelling of 423656641 in words is "four hundred twenty-three million, six hundred fifty-six thousand, six hundred forty-one".