1609966 has 4 divisors (see below), whose sum is σ = 2414952. Its totient is φ = 804982.

The previous prime is 1609913. The next prime is 1609969. The reversal of 1609966 is 6699061.

It is a semiprime because it is the product of two primes.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1609969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402490 + ... + 402493.

It is an arithmetic number, because the mean of its divisors is an integer number (603738).

2^1609966 is an apocalyptic number.

1609966 is a deficient number, since it is larger than the sum of its proper divisors (804986).

1609966 is an equidigital number, since it uses as much as digits as its factorization.

1609966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804985.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 1609966 is about 1268.8443560973. The cubic root of 1609966 is about 117.2030467433.

The spelling of 1609966 in words is "one million, six hundred nine thousand, nine hundred sixty-six".