42740257 has 8 divisors (see below), whose sum is σ = 48898496. Its totient is φ = 36595152.

The previous prime is 42740239. The next prime is 42740297. The reversal of 42740257 is 75204724.

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

It is a cyclic number.

It is not a de Polignac number, because 42740257 - 2⁷ = 42740129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42740297) 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, 5143 + ... + 10579.

It is an arithmetic number, because the mean of its divisors is an integer number (6112312).

Almost surely, 2^42740257 is an apocalyptic number.

It is an amenable number.

42740257 is a deficient number, since it is larger than the sum of its proper divisors (6158239).

42740257 is a wasteful number, since it uses less digits than its factorization.

42740257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6567.

The product of its (nonzero) digits is 15680, while the sum is 31.

The square root of 42740257 is about 6537.6033070231. The cubic root of 42740257 is about 349.6329676219.

The spelling of 42740257 in words is "forty-two million, seven hundred forty thousand, two hundred fifty-seven".