1641117438 has 48 divisors (see below), whose sum is σ = 3749616000. Its totient is φ = 517317840.

The previous prime is 1641117431. The next prime is 1641117461. The reversal of 1641117438 is 8347111461.

1641117438 is a `hidden beast` number, since 1 + 641 + 1 + 1 + 7 + 4 + 3 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641117431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 200853 + ... + 208863.

It is an arithmetic number, because the mean of its divisors is an integer number (78117000).

Almost surely, 2^1641117438 is an apocalyptic number.

1641117438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1641117438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1874808000).

1641117438 is an abundant number, since it is smaller than the sum of its proper divisors (2108498562).

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

1641117438 is a wasteful number, since it uses less digits than its factorization.

1641117438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8637 (or 8634 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 1641117438 is about 40510.7076956204. The cubic root of 1641117438 is about 1179.5414856514.

Adding to 1641117438 its reverse (8347111461), we get a palindrome (9988228899).

The spelling of 1641117438 in words is "one billion, six hundred forty-one million, one hundred seventeen thousand, four hundred thirty-eight".