40051609 has 16 divisors (see below), whose sum is σ = 46061568. Its totient is φ = 34497792.

The previous prime is 40051577. The next prime is 40051631. The reversal of 40051609 is 90615004.

It is a cyclic number.

It is not a de Polignac number, because 40051609 - 2⁵ = 40051577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40051699) 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, 27354 + ... + 28780.

It is an arithmetic number, because the mean of its divisors is an integer number (2878848).

Almost surely, 2^40051609 is an apocalyptic number.

It is an amenable number.

40051609 is a deficient number, since it is larger than the sum of its proper divisors (6009959).

40051609 is a wasteful number, since it uses less digits than its factorization.

40051609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 40051609 is about 6328.6340548336. The cubic root of 40051609 is about 342.1422097047.

The spelling of 40051609 in words is "forty million, fifty-one thousand, six hundred nine".