1609646 has 4 divisors (see below), whose sum is σ = 2414472. Its totient is φ = 804822.

The previous prime is 1609631. The next prime is 1609667. The reversal of 1609646 is 6469061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6469061 = 17 ⋅380533.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402410 + ... + 402413.

It is an arithmetic number, because the mean of its divisors is an integer number (603618).

2^1609646 is an apocalyptic number.

1609646 is a deficient number, since it is larger than the sum of its proper divisors (804826).

1609646 is an equidigital number, since it uses as much as digits as its factorization.

1609646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804825.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 1609646 is about 1268.7182508343. The cubic root of 1609646 is about 117.1952810596.

The spelling of 1609646 in words is "one million, six hundred nine thousand, six hundred forty-six".