1189643 has 16 divisors (see below), whose sum is σ = 1552320. Its totient is φ = 884736.

The previous prime is 1189637. The next prime is 1189649. The reversal of 1189643 is 3469811.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1189637) and next prime (1189649).

It is a cyclic number.

It is not a de Polignac number, because 1189643 - 2⁴ = 1189627 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1189649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1163 + ... + 1931.

It is an arithmetic number, because the mean of its divisors is an integer number (97020).

2^1189643 is an apocalyptic number.

1189643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1189643 is a deficient number, since it is larger than the sum of its proper divisors (362677).

1189643 is a wasteful number, since it uses less digits than its factorization.

1189643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806.

The product of its digits is 5184, while the sum is 32.

The square root of 1189643 is about 1090.7075685077. The cubic root of 1189643 is about 105.9592521676.

The spelling of 1189643 in words is "one million, one hundred eighty-nine thousand, six hundred forty-three".