643037 has 4 divisors (see below), whose sum is σ = 644700. Its totient is φ = 641376.

The previous prime is 643031. The next prime is 643039. The reversal of 643037 is 730346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 730346 = 2 ⋅365173.

It can be written as a sum of positive squares in 2 ways, for example, as 241081 + 401956 = 491^2 + 634^2 .

It is a cyclic number.

It is not a de Polignac number, because 643037 - 2⁴ = 643021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643031) 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, 89 + ... + 1137.

It is an arithmetic number, because the mean of its divisors is an integer number (161175).

2⁶⁴³⁰³⁷ is an apocalyptic number.

It is an amenable number.

643037 is a deficient number, since it is larger than the sum of its proper divisors (1663).

643037 is a wasteful number, since it uses less digits than its factorization.

643037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662.

The product of its (nonzero) digits is 1512, while the sum is 23.

The square root of 643037 is about 801.8958785279. The cubic root of 643037 is about 86.3134854304.

The spelling of 643037 in words is "six hundred forty-three thousand, thirty-seven".