40539919 has 4 divisors (see below), whose sum is σ = 46331344. Its totient is φ = 34748496.

The previous prime is 40539907. The next prime is 40539923. The reversal of 40539919 is 91993504.

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

It is a cyclic number.

It is not a de Polignac number, because 40539919 - 2¹⁵ = 40507151 is a prime.

It is a super-2 number, since 2×40539919² = 3286970065053122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40539979) 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, 2895702 + ... + 2895715.

It is an arithmetic number, because the mean of its divisors is an integer number (11582836).

Almost surely, 2^40539919 is an apocalyptic number.

40539919 is a deficient number, since it is larger than the sum of its proper divisors (5791425).

40539919 is an equidigital number, since it uses as much as digits as its factorization.

40539919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5791424.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 40539919 is about 6367.0965910688. The cubic root of 40539919 is about 343.5270649700.

The spelling of 40539919 in words is "forty million, five hundred thirty-nine thousand, nine hundred nineteen".