42640313 has 4 divisors (see below), whose sum is σ = 44884560. Its totient is φ = 40396068.

The previous prime is 42640309. The next prime is 42640331. The reversal of 42640313 is 31304624.

It is a happy number.

42640313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42640313 - 2² = 42640309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42640343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1122095 + ... + 1122132.

It is an arithmetic number, because the mean of its divisors is an integer number (11221140).

Almost surely, 2^42640313 is an apocalyptic number.

It is an amenable number.

42640313 is a deficient number, since it is larger than the sum of its proper divisors (2244247).

42640313 is a wasteful number, since it uses less digits than its factorization.

42640313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2244246.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 42640313 is about 6529.9550534441. The cubic root of 42640313 is about 349.3602271759.

Adding to 42640313 its reverse (31304624), we get a palindrome (73944937).

The spelling of 42640313 in words is "forty-two million, six hundred forty thousand, three hundred thirteen".