643047 has 8 divisors (see below), whose sum is σ = 869760. Its totient is φ = 422520.

The previous prime is 643043. The next prime is 643051. The reversal of 643047 is 740346.

It is an interprime number because it is at equal distance from previous prime (643043) and next prime (643051).

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

It is not a de Polignac number, because 643047 - 2² = 643043 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643043) 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, 1297 + ... + 1722.

It is an arithmetic number, because the mean of its divisors is an integer number (108720).

2⁶⁴³⁰⁴⁷ is an apocalyptic number.

643047 is a deficient number, since it is larger than the sum of its proper divisors (226713).

643047 is a wasteful number, since it uses less digits than its factorization.

643047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3093.

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 643047 is about 801.9021137271. The cubic root of 643047 is about 86.3139328543.

The spelling of 643047 in words is "six hundred forty-three thousand, forty-seven".