1965623 has 4 divisors (see below), whose sum is σ = 2144328. Its totient is φ = 1786920.

The previous prime is 1965619. The next prime is 1965629. The reversal of 1965623 is 3265691.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1965623 - 2² = 1965619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1965623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1965629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89336 + ... + 89357.

It is an arithmetic number, because the mean of its divisors is an integer number (536082).

2^1965623 is an apocalyptic number.

1965623 is a deficient number, since it is larger than the sum of its proper divisors (178705).

1965623 is a wasteful number, since it uses less digits than its factorization.

1965623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178704.

The product of its digits is 9720, while the sum is 32.

The square root of 1965623 is about 1402.0067760179. The cubic root of 1965623 is about 125.2660573063.

The spelling of 1965623 in words is "one million, nine hundred sixty-five thousand, six hundred twenty-three".