638104699 has 4 divisors (see below), whose sum is σ = 638779464. Its totient is φ = 637429936.

The previous prime is 638104697. The next prime is 638104729. The reversal of 638104699 is 996401836.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 638104699 - 2¹ = 638104697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638104693) 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, 335962 + ... + 337855.

It is an arithmetic number, because the mean of its divisors is an integer number (159694866).

Almost surely, 2^638104699 is an apocalyptic number.

638104699 is a deficient number, since it is larger than the sum of its proper divisors (674765).

638104699 is an equidigital number, since it uses as much as digits as its factorization.

638104699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674764.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 638104699 is about 25260.7343321607. The cubic root of 638104699 is about 860.9223469208.

The spelling of 638104699 in words is "six hundred thirty-eight million, one hundred four thousand, six hundred ninety-nine".