638433 has 6 divisors (see below), whose sum is σ = 922194. Its totient is φ = 425616.

The previous prime is 638431. The next prime is 638437. The reversal of 638433 is 334836.

It can be written as a sum of positive squares in only one way, i.e., 471969 + 166464 = 687^2 + 408^2 .

It is not a de Polignac number, because 638433 - 2¹ = 638431 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 638397 and 638406.

It is not an unprimeable number, because it can be changed into a prime (638431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35460 + ... + 35477.

It is an arithmetic number, because the mean of its divisors is an integer number (153699).

2⁶³⁸⁴³³ is an apocalyptic number.

It is an amenable number.

638433 is a deficient number, since it is larger than the sum of its proper divisors (283761).

638433 is a wasteful number, since it uses less digits than its factorization.

638433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70943 (or 70940 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 638433 is about 799.0200247804. The cubic root of 638433 is about 86.1069968050.

The spelling of 638433 in words is "six hundred thirty-eight thousand, four hundred thirty-three".