638285469 has 4 divisors (see below), whose sum is σ = 851047296. Its totient is φ = 425523644.

The previous prime is 638285467. The next prime is 638285471. The reversal of 638285469 is 964582836.

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 an interprime number because it is at equal distance from previous prime (638285467) and next prime (638285471).

It is a cyclic number.

It is not a de Polignac number, because 638285469 - 2¹ = 638285467 is a prime.

It is a super-2 number, since 2×638285469² = 814816679873099922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638285467) 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, 106380909 + ... + 106380914.

It is an arithmetic number, because the mean of its divisors is an integer number (212761824).

Almost surely, 2^638285469 is an apocalyptic number.

It is an amenable number.

638285469 is a deficient number, since it is larger than the sum of its proper divisors (212761827).

638285469 is a wasteful number, since it uses less digits than its factorization.

638285469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212761826.

The product of its digits is 2488320, while the sum is 51.

The square root of 638285469 is about 25264.3121616243. The cubic root of 638285469 is about 861.0036367358.

The spelling of 638285469 in words is "six hundred thirty-eight million, two hundred eighty-five thousand, four hundred sixty-nine".