8240429 has 4 divisors (see below), whose sum is σ = 8375580. Its totient is φ = 8105280.

The previous prime is 8240399. The next prime is 8240431. The reversal of 8240429 is 9240428.

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 4418404 + 3822025 = 2102^2 + 1955^2 .

It is a cyclic number.

It is not a de Polignac number, because 8240429 - 2⁸ = 8240173 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8240329) 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, 67484 + ... + 67605.

It is an arithmetic number, because the mean of its divisors is an integer number (2093895).

Almost surely, 2^8240429 is an apocalyptic number.

It is an amenable number.

8240429 is a deficient number, since it is larger than the sum of its proper divisors (135151).

8240429 is a wasteful number, since it uses less digits than its factorization.

8240429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135150.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 8240429 is about 2870.6147425247. The cubic root of 8240429 is about 201.9838319903.

Subtracting 8240429 from its reverse (9240428), we obtain a palindrome (999999).

The spelling of 8240429 in words is "eight million, two hundred forty thousand, four hundred twenty-nine".