40783809 has 16 divisors (see below), whose sum is σ = 60330240. Its totient is φ = 24297360.

The previous prime is 40783789. The next prime is 40783849. The reversal of 40783809 is 90838704.

It is not a de Polignac number, because 40783809 - 2²⁰ = 39735233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40783849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8527 + ... + 12420.

It is an arithmetic number, because the mean of its divisors is an integer number (3770640).

Almost surely, 2^40783809 is an apocalyptic number.

It is an amenable number.

40783809 is a deficient number, since it is larger than the sum of its proper divisors (19546431).

40783809 is a wasteful number, since it uses less digits than its factorization.

40783809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21020.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 40783809 is about 6386.2202436183. The cubic root of 40783809 is about 344.2145795934.

It can be divided in two parts, 4078 and 3809, that added together give a palindrome (7887).

The spelling of 40783809 in words is "forty million, seven hundred eighty-three thousand, eight hundred nine".