1605949894 has 16 divisors (see below), whose sum is σ = 2450575296. Its totient is φ = 789208000.

The previous prime is 1605949879. The next prime is 1605949903. The reversal of 1605949894 is 4989495061.

It is a super-2 number, since 2×1605949894² = 5158150124077222472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1342 + ... + 56689.

It is an arithmetic number, because the mean of its divisors is an integer number (153160956).

Almost surely, 2^1605949894 is an apocalyptic number.

1605949894 is a deficient number, since it is larger than the sum of its proper divisors (844625402).

1605949894 is a wasteful number, since it uses less digits than its factorization.

1605949894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58271.

The product of its (nonzero) digits is 2799360, while the sum is 55.

The square root of 1605949894 is about 40074.3046602184. The cubic root of 1605949894 is about 1171.0551015063.

The spelling of 1605949894 in words is "one billion, six hundred five million, nine hundred forty-nine thousand, eight hundred ninety-four".