638363697 has 4 divisors (see below), whose sum is σ = 851151600. Its totient is φ = 425575796.

The previous prime is 638363683. The next prime is 638363699. The reversal of 638363697 is 796363836.

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 not a de Polignac number, because 638363697 - 2⁸ = 638363441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638363699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106393947 + ... + 106393952.

It is an arithmetic number, because the mean of its divisors is an integer number (212787900).

Almost surely, 2^638363697 is an apocalyptic number.

It is an amenable number.

638363697 is a deficient number, since it is larger than the sum of its proper divisors (212787903).

638363697 is a wasteful number, since it uses less digits than its factorization.

638363697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212787902.

The product of its digits is 2939328, while the sum is 51.

The square root of 638363697 is about 25265.8603059544. The cubic root of 638363697 is about 861.0388100474.

The spelling of 638363697 in words is "six hundred thirty-eight million, three hundred sixty-three thousand, six hundred ninety-seven".