1605444366 has 8 divisors (see below), whose sum is σ = 3210888744. Its totient is φ = 535148120.

The previous prime is 1605444361. The next prime is 1605444383. The reversal of 1605444366 is 6634445061.

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

1605444366 is an admirable number.

It is a super-2 number, since 2×1605444366² = 5154903224642283912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605444361) 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, 133787025 + ... + 133787036.

It is an arithmetic number, because the mean of its divisors is an integer number (401361093).

Almost surely, 2^1605444366 is an apocalyptic number.

1605444366 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1605444366 is a wasteful number, since it uses less digits than its factorization.

1605444366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267574066.

The product of its (nonzero) digits is 207360, while the sum is 39.

The square root of 1605444366 is about 40067.9967804731. The cubic root of 1605444366 is about 1170.9322119786.

The spelling of 1605444366 in words is "one billion, six hundred five million, four hundred forty-four thousand, three hundred sixty-six".