423551405 has 4 divisors (see below), whose sum is σ = 508261692. Its totient is φ = 338841120.

The previous prime is 423551389. The next prime is 423551441. The reversal of 423551405 is 504155324.

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 59428681 + 364122724 = 7709^2 + 19082^2 .

It is not a de Polignac number, because 423551405 - 2⁴ = 423551389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42355136 + ... + 42355145.

It is an arithmetic number, because the mean of its divisors is an integer number (127065423).

Almost surely, 2^423551405 is an apocalyptic number.

It is an amenable number.

423551405 is a deficient number, since it is larger than the sum of its proper divisors (84710287).

423551405 is an equidigital number, since it uses as much as digits as its factorization.

423551405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84710286.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 423551405 is about 20580.3645497353. The cubic root of 423551405 is about 750.9921122243.

The spelling of 423551405 in words is "four hundred twenty-three million, five hundred fifty-one thousand, four hundred five".