40020100 has 72 divisors (see below), whose sum is σ = 91431648. Its totient is φ = 15187200.

The previous prime is 40020089. The next prime is 40020103. The reversal of 40020100 is 102004.

It is not an unprimeable number, because it can be changed into a prime (40020103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 176187 + ... + 176413.

It is an arithmetic number, because the mean of its divisors is an integer number (1269884).

Almost surely, 2^40020100 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40020100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45715824).

40020100 is an abundant number, since it is smaller than the sum of its proper divisors (51411548).

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

40020100 is a wasteful number, since it uses less digits than its factorization.

40020100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325 (or 318 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 40020100 is about 6326.1441652874. The cubic root of 40020100 is about 342.0524639371.

Adding to 40020100 its reverse (102004), we get a palindrome (40122104).

The spelling of 40020100 in words is "forty million, twenty thousand, one hundred".