1641797388 has 144 divisors (see below), whose sum is σ = 5212596480. Its totient is φ = 423273600.

The previous prime is 1641797363. The next prime is 1641797393. The reversal of 1641797388 is 8837971461.

1641797388 is a `hidden beast` number, since 164 + 17 + 97 + 388 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 383178 + ... + 387438.

Almost surely, 2^1641797388 is an apocalyptic number.

1641797388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1641797388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2606298240).

1641797388 is an abundant number, since it is smaller than the sum of its proper divisors (3570799092).

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

1641797388 is a wasteful number, since it uses less digits than its factorization.

1641797388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4428 (or 4423 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 1641797388 is about 40519.0990521754. The cubic root of 1641797388 is about 1179.7043662339.

The spelling of 1641797388 in words is "one billion, six hundred forty-one million, seven hundred ninety-seven thousand, three hundred eighty-eight".