42756247 has 4 divisors (see below), whose sum is σ = 42802816. Its totient is φ = 42709680.

The previous prime is 42756239. The next prime is 42756253. The reversal of 42756247 is 74265724.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42756247 - 2³ = 42756239 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 (42756257) 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, 21879 + ... + 23752.

It is an arithmetic number, because the mean of its divisors is an integer number (10700704).

Almost surely, 2^42756247 is an apocalyptic number.

42756247 is a deficient number, since it is larger than the sum of its proper divisors (46569).

42756247 is an equidigital number, since it uses as much as digits as its factorization.

42756247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46568.

The product of its digits is 94080, while the sum is 37.

The square root of 42756247 is about 6538.8261178900. The cubic root of 42756247 is about 349.6765637886.

The spelling of 42756247 in words is "forty-two million, seven hundred fifty-six thousand, two hundred forty-seven".