638432254 has 4 divisors (see below), whose sum is σ = 957648384. Its totient is φ = 319216126.

The previous prime is 638432239. The next prime is 638432257. The reversal of 638432254 is 452234836.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638432257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159608062 + ... + 159608065.

It is an arithmetic number, because the mean of its divisors is an integer number (239412096).

Almost surely, 2^638432254 is an apocalyptic number.

638432254 is a deficient number, since it is larger than the sum of its proper divisors (319216130).

638432254 is a wasteful number, since it uses less digits than its factorization.

638432254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319216129.

The product of its digits is 138240, while the sum is 37.

The square root of 638432254 is about 25267.2169816939. The cubic root of 638432254 is about 861.0696326672.

The spelling of 638432254 in words is "six hundred thirty-eight million, four hundred thirty-two thousand, two hundred fifty-four".