445037821 has 4 divisors (see below), whose sum is σ = 455892444. Its totient is φ = 434183200.

The previous prime is 445037797. The next prime is 445037839. The reversal of 445037821 is 128730544.

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 61308900 + 383728921 = 7830^2 + 19589^2 .

It is a cyclic number.

It is not a de Polignac number, because 445037821 - 2⁷ = 445037693 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 (445037861) 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, 5427250 + ... + 5427331.

It is an arithmetic number, because the mean of its divisors is an integer number (113973111).

Almost surely, 2^445037821 is an apocalyptic number.

445037821 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

445037821 is a deficient number, since it is larger than the sum of its proper divisors (10854623).

445037821 is a wasteful number, since it uses less digits than its factorization.

445037821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10854622.

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 445037821 is about 21095.9195343555. The cubic root of 445037821 is about 763.4823006347.

The spelling of 445037821 in words is "four hundred forty-five million, thirty-seven thousand, eight hundred twenty-one".