42402317 has 4 divisors (see below), whose sum is σ = 44245920. Its totient is φ = 40558716.

The previous prime is 42402307. The next prime is 42402377. The reversal of 42402317 is 71320424.

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 42402317 - 2¹⁸ = 42140173 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 1843579 = 42402317 / (4 + 2 + 4 + 0 + 2 + 3 + 1 + 7).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42402292 and 42402301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42402307) 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, 921767 + ... + 921812.

It is an arithmetic number, because the mean of its divisors is an integer number (11061480).

Almost surely, 2^42402317 is an apocalyptic number.

It is an amenable number.

42402317 is a deficient number, since it is larger than the sum of its proper divisors (1843603).

42402317 is a wasteful number, since it uses less digits than its factorization.

42402317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843602.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 42402317 is about 6511.7061512326. The cubic root of 42402317 is about 348.7090318992.

The spelling of 42402317 in words is "forty-two million, four hundred two thousand, three hundred seventeen".