1645616 has 30 divisors (see below), whose sum is σ = 3710700. Its totient is φ = 704928.

The previous prime is 1645613. The next prime is 1645643. The reversal of 1645616 is 6165461.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1645613) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 266 + ... + 1833.

It is an arithmetic number, because the mean of its divisors is an integer number (123690).

2^1645616 is an apocalyptic number.

1645616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1645616 is an abundant number, since it is smaller than the sum of its proper divisors (2065084).

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

1645616 is a wasteful number, since it uses less digits than its factorization.

1645616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121 (or 2108 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 1645616 is about 1282.8156531630. The cubic root of 1645616 is about 118.0618272183.

The spelling of 1645616 in words is "one million, six hundred forty-five thousand, six hundred sixteen".