40809152 has 42 divisors (see below), whose sum is σ = 82901028. Its totient is φ = 19931392.

The previous prime is 40809137. The next prime is 40809157. The reversal of 40809152 is 25190804.

It is not an unprimeable number, because it can be changed into a prime (40809157) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 179663 + ... + 179889.

It is an arithmetic number, because the mean of its divisors is an integer number (1973834).

Almost surely, 2^40809152 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 40809152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41450514).

40809152 is an abundant number, since it is smaller than the sum of its proper divisors (42091876).

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

40809152 is an equidigital number, since it uses as much as digits as its factorization.

40809152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 40809152 is about 6388.2041294874. The cubic root of 40809152 is about 344.2858629778.

Adding to 40809152 its reverse (25190804), we get a palindrome (65999956).

The spelling of 40809152 in words is "forty million, eight hundred nine thousand, one hundred fifty-two".