421444007 has 4 divisors (see below), whose sum is σ = 422030880. Its totient is φ = 420857136.

The previous prime is 421443941. The next prime is 421444033. The reversal of 421444007 is 700444124.

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

It is a cyclic number.

It is not a de Polignac number, because 421444007 - 2²⁶ = 354335143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421444607) by changing a digit.

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, 292358 + ... + 293795.

It is an arithmetic number, because the mean of its divisors is an integer number (105507720).

Almost surely, 2^421444007 is an apocalyptic number.

421444007 is a deficient number, since it is larger than the sum of its proper divisors (586873).

421444007 is an equidigital number, since it uses as much as digits as its factorization.

421444007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586872.

The product of its (nonzero) digits is 3584, while the sum is 26.

The square root of 421444007 is about 20529.1014659678. The cubic root of 421444007 is about 749.7445097169.

The spelling of 421444007 in words is "four hundred twenty-one million, four hundred forty-four thousand, seven".