638001269 has 4 divisors (see below), whose sum is σ = 647523744. Its totient is φ = 628478796.

The previous prime is 638001263. The next prime is 638001271. The reversal of 638001269 is 962100836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 638001269 - 2⁴ = 638001253 is a prime.

It is a super-2 number, since 2×638001269² = 814091238491220722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638001263) 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, 4761137 + ... + 4761270.

It is an arithmetic number, because the mean of its divisors is an integer number (161880936).

Almost surely, 2^638001269 is an apocalyptic number.

It is an amenable number.

638001269 is a deficient number, since it is larger than the sum of its proper divisors (9522475).

638001269 is an equidigital number, since it uses as much as digits as its factorization.

638001269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9522474.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 638001269 is about 25258.6870007132. The cubic root of 638001269 is about 860.8758289486.

The spelling of 638001269 in words is "six hundred thirty-eight million, one thousand, two hundred sixty-nine".