1238920638 has 8 divisors (see below), whose sum is σ = 2477841288. Its totient is φ = 412973544.

The previous prime is 1238920637. The next prime is 1238920649. The reversal of 1238920638 is 8360298321.

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

1238920638 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 1238920638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1238920637) 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, 103243381 + ... + 103243392.

It is an arithmetic number, because the mean of its divisors is an integer number (309730161).

Almost surely, 2^1238920638 is an apocalyptic number.

1238920638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1238920638 is a wasteful number, since it uses less digits than its factorization.

1238920638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206486778.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 1238920638 is about 35198.3044762102. The cubic root of 1238920638 is about 1074.0252604429.

The spelling of 1238920638 in words is "one billion, two hundred thirty-eight million, nine hundred twenty thousand, six hundred thirty-eight".