1609660 has 48 divisors (see below), whose sum is σ = 3753792. Its totient is φ = 576000.

The previous prime is 1609631. The next prime is 1609667. The reversal of 1609660 is 669061.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1609667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10585 + ... + 10735.

It is an arithmetic number, because the mean of its divisors is an integer number (78204).

2^1609660 is an apocalyptic number.

1609660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1609660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1876896).

1609660 is an abundant number, since it is smaller than the sum of its proper divisors (2144132).

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

1609660 is a wasteful number, since it uses less digits than its factorization.

1609660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 1609660 is about 1268.7237682017. The cubic root of 1609660 is about 117.1956208298.

The spelling of 1609660 in words is "one million, six hundred nine thousand, six hundred sixty".