1609605 has 16 divisors (see below), whose sum is σ = 2861760. Its totient is φ = 858384.

The previous prime is 1609589. The next prime is 1609627. The reversal of 1609605 is 5069061.

It is not a de Polignac number, because 1609605 - 2⁴ = 1609589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5827 + ... + 6096.

It is an arithmetic number, because the mean of its divisors is an integer number (178860).

2^1609605 is an apocalyptic number.

1609605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1609605 is a deficient number, since it is larger than the sum of its proper divisors (1252155).

1609605 is a wasteful number, since it uses less digits than its factorization.

1609605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11937 (or 11931 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 1609605 is about 1268.7020926916. The cubic root of 1609605 is about 117.1942860070.

The spelling of 1609605 in words is "one million, six hundred nine thousand, six hundred five".