30040405 has 4 divisors (see below), whose sum is σ = 36048492. Its totient is φ = 24032320.

The previous prime is 30040403. The next prime is 30040427. The reversal of 30040405 is 50404003.

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 14814801 + 15225604 = 3849^2 + 3902^2 .

It is not a de Polignac number, because 30040405 - 2¹ = 30040403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30040403) 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, 3004036 + ... + 3004045.

It is an arithmetic number, because the mean of its divisors is an integer number (9012123).

Almost surely, 2^30040405 is an apocalyptic number.

It is an amenable number.

30040405 is a deficient number, since it is larger than the sum of its proper divisors (6008087).

30040405 is an equidigital number, since it uses as much as digits as its factorization.

30040405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6008086.

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 30040405 is about 5480.9127889431. The cubic root of 30040405 is about 310.8626854927.

Adding to 30040405 its reverse (50404003), we get a palindrome (80444408).

The spelling of 30040405 in words is "thirty million, forty thousand, four hundred five".