40624009 has 4 divisors (see below), whose sum is σ = 40637700. Its totient is φ = 40610320.

The previous prime is 40624007. The next prime is 40624013. The reversal of 40624009 is 90042604.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 5161984 + 35462025 = 2272^2 + 5955^2 .

It is a cyclic number.

It is not a de Polignac number, because 40624009 - 2¹ = 40624007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40624007) 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, 322 + ... + 9019.

It is an arithmetic number, because the mean of its divisors is an integer number (10159425).

Almost surely, 2^40624009 is an apocalyptic number.

It is an amenable number.

40624009 is a deficient number, since it is larger than the sum of its proper divisors (13691).

40624009 is an equidigital number, since it uses as much as digits as its factorization.

40624009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13690.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 40624009 is about 6373.6966510809. The cubic root of 40624009 is about 343.7644214776.

The spelling of 40624009 in words is "forty million, six hundred twenty-four thousand, nine".