40991100 has 72 divisors (see below), whose sum is σ = 119575680. Its totient is φ = 10841280.

The previous prime is 40991099. The next prime is 40991107. The reversal of 40991100 is 119904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40991107) 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, 41209 + ... + 42191.

Almost surely, 2^40991100 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 40991100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59787840).

40991100 is an abundant number, since it is smaller than the sum of its proper divisors (78584580).

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

40991100 is a wasteful number, since it uses less digits than its factorization.

40991100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139 (or 1132 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 40991100 is about 6402.4292264733. The cubic root of 40991100 is about 344.7967717177.

The spelling of 40991100 in words is "forty million, nine hundred ninety-one thousand, one hundred".