40809000 has 128 divisors (see below), whose sum is σ = 129991680. Its totient is φ = 10656000.

The previous prime is 40808987. The next prime is 40809029. The reversal of 40809000 is 90804.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 182889 + ... + 183111.

It is an arithmetic number, because the mean of its divisors is an integer number (1015560).

Almost surely, 2^40809000 is an apocalyptic number.

40809000 is a gapful number since it is divisible by the number (40) 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 40809000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64995840).

40809000 is an abundant number, since it is smaller than the sum of its proper divisors (89182680).

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

40809000 is a wasteful number, since it uses less digits than its factorization.

40809000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308 (or 294 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 40809000 is about 6388.1922325490. The cubic root of 40809000 is about 344.2854355286.

Adding to 40809000 its reverse (90804), we get a palindrome (40899804).

The spelling of 40809000 in words is "forty million, eight hundred nine thousand".