40404709 has 8 divisors (see below), whose sum is σ = 41328792. Its totient is φ = 39486720.

The previous prime is 40404667. The next prime is 40404757. The reversal of 40404709 is 90740404.

It can be written as a sum of positive squares in 4 ways, for example, as 26040609 + 14364100 = 5103^2 + 3790^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40404709 - 2²¹ = 38307557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40404779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13537 + ... + 16249.

It is an arithmetic number, because the mean of its divisors is an integer number (5166099).

Almost surely, 2^40404709 is an apocalyptic number.

It is an amenable number.

40404709 is a deficient number, since it is larger than the sum of its proper divisors (924083).

40404709 is a wasteful number, since it uses less digits than its factorization.

40404709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3047.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 40404709 is about 6356.4698536216. The cubic root of 40404709 is about 343.1447255369.

The spelling of 40404709 in words is "forty million, four hundred four thousand, seven hundred nine".