638049459 has 8 divisors (see below), whose sum is σ = 853504960. Its totient is φ = 423980136.

The previous prime is 638049403. The next prime is 638049473. The reversal of 638049459 is 954940836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 638049459 - 2⁷ = 638049331 is a prime.

It is a super-3 number, since 3×638049459³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638049959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 345469 + ... + 347310.

It is an arithmetic number, because the mean of its divisors is an integer number (106688120).

Almost surely, 2^638049459 is an apocalyptic number.

638049459 is a deficient number, since it is larger than the sum of its proper divisors (215455501).

638049459 is a wasteful number, since it uses less digits than its factorization.

638049459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693089.

The product of its (nonzero) digits is 933120, while the sum is 48.

The square root of 638049459 is about 25259.6409119370. The cubic root of 638049459 is about 860.8975031802.

The spelling of 638049459 in words is "six hundred thirty-eight million, forty-nine thousand, four hundred fifty-nine".