420478393 has 4 divisors (see below), whose sum is σ = 420774480. Its totient is φ = 420182308.

The previous prime is 420478349. The next prime is 420478439. The reversal of 420478393 is 393874024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 420478393 - 2¹³ = 420470201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420478343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145903 + ... + 148756.

It is an arithmetic number, because the mean of its divisors is an integer number (105193620).

Almost surely, 2^420478393 is an apocalyptic number.

It is an amenable number.

420478393 is a deficient number, since it is larger than the sum of its proper divisors (296087).

420478393 is a wasteful number, since it uses less digits than its factorization.

420478393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296086.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 420478393 is about 20505.5698043239. The cubic root of 420478393 is about 749.1714660828.

The spelling of 420478393 in words is "four hundred twenty million, four hundred seventy-eight thousand, three hundred ninety-three".