1640243100 has 72 divisors (see below), whose sum is σ = 4783249408. Its totient is φ = 433944000.

The previous prime is 1640243069. The next prime is 1640243123. The reversal of 1640243100 is 13420461.

It is a super-2 number, since 2×1640243100² = 5380794854195220000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16575 + ... + 59625.

Almost surely, 2^1640243100 is an apocalyptic number.

1640243100 is a gapful number since it is divisible by the number (10) 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 1640243100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2391624704).

1640243100 is an abundant number, since it is smaller than the sum of its proper divisors (3143006308).

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

1640243100 is a wasteful number, since it uses less digits than its factorization.

1640243100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43195 (or 43188 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1640243100 is about 40499.9148147252. The cubic root of 1640243100 is about 1179.3319737003.

Adding to 1640243100 its reverse (13420461), we get a palindrome (1653663561).

The spelling of 1640243100 in words is "one billion, six hundred forty million, two hundred forty-three thousand, one hundred".