445042421 has 4 divisors (see below), whose sum is σ = 446325312. Its totient is φ = 443759532.

The previous prime is 445042393. The next prime is 445042427. The reversal of 445042421 is 124240544.

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 a de Polignac number, because none of the positive numbers 2^k-445042421 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 (445042427) 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, 640925 + ... + 641618.

It is an arithmetic number, because the mean of its divisors is an integer number (111581328).

Almost surely, 2^445042421 is an apocalyptic number.

It is an amenable number.

445042421 is a deficient number, since it is larger than the sum of its proper divisors (1282891).

445042421 is a wasteful number, since it uses less digits than its factorization.

445042421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282890.

The product of its (nonzero) digits is 5120, while the sum is 26.

The square root of 445042421 is about 21096.0285598972. The cubic root of 445042421 is about 763.4849311276.

Adding to 445042421 its reverse (124240544), we get a palindrome (569282965).

The spelling of 445042421 in words is "four hundred forty-five million, forty-two thousand, four hundred twenty-one".