42708257 has 4 divisors (see below), whose sum is σ = 44956080. Its totient is φ = 40460436.

The previous prime is 42708247. The next prime is 42708277. The reversal of 42708257 is 75280724.

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 42708257 - 2⁴ = 42708241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42708247) 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, 1123883 + ... + 1123920.

It is an arithmetic number, because the mean of its divisors is an integer number (11239020).

Almost surely, 2^42708257 is an apocalyptic number.

It is an amenable number.

42708257 is a deficient number, since it is larger than the sum of its proper divisors (2247823).

42708257 is a wasteful number, since it uses less digits than its factorization.

42708257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2247822.

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 42708257 is about 6535.1554686939. The cubic root of 42708257 is about 349.5456880939.

The spelling of 42708257 in words is "forty-two million, seven hundred eight thousand, two hundred fifty-seven".