638453 has 2 divisors, whose sum is σ = 638454. Its totient is φ = 638452.

The previous prime is 638437. The next prime is 638459. The reversal of 638453 is 354836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 628849 + 9604 = 793^2 + 98^2 .

It is a cyclic number.

It is not a de Polignac number, because 638453 - 2⁴ = 638437 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319226 + 319227.

It is an arithmetic number, because the mean of its divisors is an integer number (319227).

2⁶³⁸⁴⁵³ is an apocalyptic number.

It is an amenable number.

638453 is a deficient number, since it is larger than the sum of its proper divisors (1).

638453 is an equidigital number, since it uses as much as digits as its factorization.

638453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 29.

The square root of 638453 is about 799.0325400132. The cubic root of 638453 is about 86.1078959450.

The spelling of 638453 in words is "six hundred thirty-eight thousand, four hundred fifty-three".