442640365 has 8 divisors (see below), whose sum is σ = 541190808. Its totient is φ = 347430720.

The previous prime is 442640333. The next prime is 442640371. The reversal of 442640365 is 563046244.

It can be written as a sum of positive squares in 4 ways, for example, as 213481321 + 229159044 = 14611^2 + 15138^2 .

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

It is not a de Polignac number, because 442640365 - 2⁵ = 442640333 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 442640365.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 834906 + ... + 835435.

It is an arithmetic number, because the mean of its divisors is an integer number (67648851).

Almost surely, 2^442640365 is an apocalyptic number.

It is an amenable number.

442640365 is a deficient number, since it is larger than the sum of its proper divisors (98550443).

442640365 is a wasteful number, since it uses less digits than its factorization.

442640365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670399.

The product of its (nonzero) digits is 69120, while the sum is 34.

The square root of 442640365 is about 21039.0200579780. The cubic root of 442640365 is about 762.1088503531.

The spelling of 442640365 in words is "four hundred forty-two million, six hundred forty thousand, three hundred sixty-five".