1187643 has 8 divisors (see below), whose sum is σ = 1617408. Its totient is φ = 774824.

The previous prime is 1187639. The next prime is 1187657. The reversal of 1187643 is 3467811.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1187643 - 2² = 1187639 is a prime.

1187643 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1187643.

It is not an unprimeable number, because it can be changed into a prime (1187623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4071 + ... + 4352.

It is an arithmetic number, because the mean of its divisors is an integer number (202176).

2^1187643 is an apocalyptic number.

1187643 is a deficient number, since it is larger than the sum of its proper divisors (429765).

1187643 is an equidigital number, since it uses as much as digits as its factorization.

1187643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8473.

The product of its digits is 4032, while the sum is 30.

The square root of 1187643 is about 1089.7903468099. The cubic root of 1187643 is about 105.8998401219.

It can be divided in two parts, 1187 and 643, that added together give a triangular number (1830 = T₆₀).

The spelling of 1187643 in words is "one million, one hundred eighty-seven thousand, six hundred forty-three".