42640717 has 8 divisors (see below), whose sum is σ = 50304512. Its totient is φ = 35370000.

The previous prime is 42640711. The next prime is 42640723. The reversal of 42640717 is 71704624.

It is an interprime number because it is at equal distance from previous prime (42640711) and next prime (42640723).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42640717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42640711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98034 + ... + 98467.

It is an arithmetic number, because the mean of its divisors is an integer number (6288064).

Almost surely, 2^42640717 is an apocalyptic number.

It is an amenable number.

42640717 is a deficient number, since it is larger than the sum of its proper divisors (7663795).

42640717 is a wasteful number, since it uses less digits than its factorization.

42640717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196539.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 42640717 is about 6529.9859877338. The cubic root of 42640717 is about 349.3613305221.

The spelling of 42640717 in words is "forty-two million, six hundred forty thousand, seven hundred seventeen".