445215557 has 8 divisors (see below), whose sum is σ = 448058520. Its totient is φ = 442382080.

The previous prime is 445215553. The next prime is 445215559. The reversal of 445215557 is 755512544.

It can be written as a sum of positive squares in 4 ways, for example, as 6145441 + 439070116 = 2479^2 + 20954^2 .

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 445215557 - 2² = 445215553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 445215557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445215553) 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, 107273 + ... + 111345.

It is an arithmetic number, because the mean of its divisors is an integer number (56007315).

Almost surely, 2^445215557 is an apocalyptic number.

It is an amenable number.

445215557 is a deficient number, since it is larger than the sum of its proper divisors (2842963).

445215557 is a wasteful number, since it uses less digits than its factorization.

445215557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4743.

The product of its digits is 140000, while the sum is 38.

The square root of 445215557 is about 21100.1316820536. The cubic root of 445215557 is about 763.5839251282.

The spelling of 445215557 in words is "four hundred forty-five million, two hundred fifteen thousand, five hundred fifty-seven".