40742609 has 4 divisors (see below), whose sum is σ = 40859700. Its totient is φ = 40625520.

The previous prime is 40742573. The next prime is 40742617. The reversal of 40742609 is 90624704.

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 22278400 + 18464209 = 4720^2 + 4297^2 .

It is a cyclic number.

It is not a de Polignac number, because 40742609 - 2¹² = 40738513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40742209) 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, 58022 + ... + 58719.

It is an arithmetic number, because the mean of its divisors is an integer number (10214925).

Almost surely, 2^40742609 is an apocalyptic number.

It is an amenable number.

40742609 is a deficient number, since it is larger than the sum of its proper divisors (117091).

40742609 is a wasteful number, since it uses less digits than its factorization.

40742609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117090.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 40742609 is about 6382.9937333511. The cubic root of 40742609 is about 344.0986314663.

The spelling of 40742609 in words is "forty million, seven hundred forty-two thousand, six hundred nine".