1231338638 has 8 divisors (see below), whose sum is σ = 1850771160. Its totient is φ = 614414920.

The previous prime is 1231338613. The next prime is 1231338671. The reversal of 1231338638 is 8368331321.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 625973 + ... + 627936.

It is an arithmetic number, because the mean of its divisors is an integer number (231346395).

Almost surely, 2^1231338638 is an apocalyptic number.

1231338638 is a deficient number, since it is larger than the sum of its proper divisors (619432522).

1231338638 is a wasteful number, since it uses less digits than its factorization.

1231338638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254402.

The product of its digits is 62208, while the sum is 38.

The square root of 1231338638 is about 35090.4351355181. The cubic root of 1231338638 is about 1071.8298203670.

Adding to 1231338638 its reverse (8368331321), we get a palindrome (9599669959).

The spelling of 1231338638 in words is "one billion, two hundred thirty-one million, three hundred thirty-eight thousand, six hundred thirty-eight".