40809769 has 32 divisors (see below), whose sum is σ = 55802880. Its totient is φ = 28814400.

The previous prime is 40809761. The next prime is 40809773. The reversal of 40809769 is 96790804.

It is a cyclic number.

It is not a de Polignac number, because 40809769 - 2³ = 40809761 is a prime.

It is a super-2 number, since 2×40809769² = 3330874491666722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (40809761) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58714 + ... + 59404.

It is an arithmetic number, because the mean of its divisors is an integer number (1743840).

Almost surely, 2^40809769 is an apocalyptic number.

It is an amenable number.

40809769 is a deficient number, since it is larger than the sum of its proper divisors (14993111).

40809769 is a wasteful number, since it uses less digits than its factorization.

40809769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 40809769 is about 6388.2524214373. The cubic root of 40809769 is about 344.2875980732.

The spelling of 40809769 in words is "forty million, eight hundred nine thousand, seven hundred sixty-nine".