42907257 has 6 divisors (see below), whose sum is σ = 61977162. Its totient is φ = 28604832.

The previous prime is 42907243. The next prime is 42907261. The reversal of 42907257 is 75270924.

It can be written as a sum of positive squares in only one way, i.e., 41100921 + 1806336 = 6411^2 + 1344^2 .

It is not a de Polignac number, because 42907257 - 2⁷ = 42907129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42907237) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2383728 + ... + 2383745.

It is an arithmetic number, because the mean of its divisors is an integer number (10329527).

Almost surely, 2^42907257 is an apocalyptic number.

It is an amenable number.

42907257 is a deficient number, since it is larger than the sum of its proper divisors (19069905).

42907257 is a wasteful number, since it uses less digits than its factorization.

42907257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4767479 (or 4767476 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 42907257 is about 6550.3631197057. The cubic root of 42907257 is about 350.0877521466.

The spelling of 42907257 in words is "forty-two million, nine hundred seven thousand, two hundred fifty-seven".