1955643 has 4 divisors (see below), whose sum is σ = 2607528. Its totient is φ = 1303760.

The previous prime is 1955641. The next prime is 1955671. The reversal of 1955643 is 3465591.

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 1955643 - 2¹ = 1955641 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1955641) 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, 325938 + ... + 325943.

It is an arithmetic number, because the mean of its divisors is an integer number (651882).

2^1955643 is an apocalyptic number.

1955643 is a deficient number, since it is larger than the sum of its proper divisors (651885).

1955643 is an equidigital number, since it uses as much as digits as its factorization.

1955643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651884.

The product of its digits is 16200, while the sum is 33.

The square root of 1955643 is about 1398.4430628381. The cubic root of 1955643 is about 125.0536942654.

The spelling of 1955643 in words is "one million, nine hundred fifty-five thousand, six hundred forty-three".