40013599 has 4 divisors (see below), whose sum is σ = 40463280. Its totient is φ = 39563920.

The previous prime is 40013593. The next prime is 40013627. The reversal of 40013599 is 99531004.

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 40013599 - 2¹¹ = 40011551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40013599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40013593) 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, 224707 + ... + 224884.

It is an arithmetic number, because the mean of its divisors is an integer number (10115820).

Almost surely, 2^40013599 is an apocalyptic number.

40013599 is a deficient number, since it is larger than the sum of its proper divisors (449681).

40013599 is an equidigital number, since it uses as much as digits as its factorization.

40013599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449680.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 40013599 is about 6325.6303243234. The cubic root of 40013599 is about 342.0339415489.

The spelling of 40013599 in words is "forty million, thirteen thousand, five hundred ninety-nine".