638069 has 4 divisors (see below), whose sum is σ = 639744. Its totient is φ = 636396.

The previous prime is 638063. The next prime is 638081. The reversal of 638069 is 960836.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-638069 is a prime.

It is a super-2 number, since 2×638069² = 814264097522, 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 (638063) 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, 44 + ... + 1130.

It is an arithmetic number, because the mean of its divisors is an integer number (159936).

2⁶³⁸⁰⁶⁹ is an apocalyptic number.

It is an amenable number.

638069 is a deficient number, since it is larger than the sum of its proper divisors (1675).

638069 is a wasteful number, since it uses less digits than its factorization.

638069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1674.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 638069 is about 798.7922132820. The cubic root of 638069 is about 86.0906291750.

The spelling of 638069 in words is "six hundred thirty-eight thousand, sixty-nine".