100643940 has 36 divisors (see below), whose sum is σ = 305287164. Its totient is φ = 26838336.

The previous prime is 100643843. The next prime is 100643941. The reversal of 100643940 is 49346001.

100643940 is a `hidden beast` number, since 10 + 0 + 643 + 9 + 4 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 35712576 + 64931364 = 5976^2 + 8058^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (100643941) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 279387 + ... + 279746.

It is an arithmetic number, because the mean of its divisors is an integer number (8480199).

Almost surely, 2^100643940 is an apocalyptic number.

100643940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100643940 is an abundant number, since it is smaller than the sum of its proper divisors (204643224).

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

100643940 is a wasteful number, since it uses less digits than its factorization.

100643940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559148 (or 559143 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 100643940 is about 10032.1453338755. The cubic root of 100643940 is about 465.1530540221.

Adding to 100643940 its reverse (49346001), we get a palindrome (149989941).

The spelling of 100643940 in words is "one hundred million, six hundred forty-three thousand, nine hundred forty".