1605861 has 12 divisors (see below), whose sum is σ = 2441920. Its totient is φ = 1014120.

The previous prime is 1605859. The next prime is 1605869. The reversal of 1605861 is 1685061.

It is not a de Polignac number, because 1605861 - 2¹ = 1605859 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605869) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4525 + ... + 4866.

2^1605861 is an apocalyptic number.

It is an amenable number.

1605861 is a deficient number, since it is larger than the sum of its proper divisors (836059).

1605861 is a wasteful number, since it uses less digits than its factorization.

1605861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9416 (or 9413 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1605861 is about 1267.2257099665. The cubic root of 1605861 is about 117.1033494005.

The spelling of 1605861 in words is "one million, six hundred five thousand, eight hundred sixty-one".