445721243 has 8 divisors (see below), whose sum is σ = 486670656. Its totient is φ = 404843400.

The previous prime is 445721201. The next prime is 445721261. The reversal of 445721243 is 342127544.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 445721243 - 2¹⁴ = 445704859 is a prime.

It is a super-2 number, since 2×445721243² = 397334852922930098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (445721443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4421 + ... + 30182.

It is an arithmetic number, because the mean of its divisors is an integer number (60833832).

Almost surely, 2^445721243 is an apocalyptic number.

445721243 is a deficient number, since it is larger than the sum of its proper divisors (40949413).

445721243 is a wasteful number, since it uses less digits than its factorization.

445721243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35785.

The product of its digits is 26880, while the sum is 32.

The square root of 445721243 is about 21112.1112871262. Note that the first 3 decimals coincide. The cubic root of 445721243 is about 763.8729144307.

Adding to 445721243 its reverse (342127544), we get a palindrome (787848787).

The spelling of 445721243 in words is "four hundred forty-five million, seven hundred twenty-one thousand, two hundred forty-three".