40740409 has 4 divisors (see below), whose sum is σ = 40758516. Its totient is φ = 40722304.

The previous prime is 40740407. The next prime is 40740419. The reversal of 40740409 is 90404704.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11580409 + 29160000 = 3403^2 + 5400^2 .

It is a cyclic number.

It is not a de Polignac number, because 40740409 - 2¹ = 40740407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40740407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5104 + ... + 10369.

It is an arithmetic number, because the mean of its divisors is an integer number (10189629).

Almost surely, 2^40740409 is an apocalyptic number.

It is an amenable number.

40740409 is a deficient number, since it is larger than the sum of its proper divisors (18107).

40740409 is a wasteful number, since it uses less digits than its factorization.

40740409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18106.

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

The square root of 40740409 is about 6382.8213980966. The cubic root of 40740409 is about 344.0924378634.

The spelling of 40740409 in words is "forty million, seven hundred forty thousand, four hundred nine".