4042657 has 6 divisors (see below), whose sum is σ = 4156278. Its totient is φ = 3932064.

The previous prime is 4042639. The next prime is 4042673. The reversal of 4042657 is 7562404.

It can be written as a sum of positive squares in 3 ways, for example, as 2927521 + 1115136 = 1711^2 + 1056^2 .

It is a de Polignac number, because none of the positive numbers 2^k-4042657 is a prime.

It is a Duffinian number.

4042657 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4042607) 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, 108 + ... + 2845.

It is an arithmetic number, because the mean of its divisors is an integer number (692713).

Almost surely, 2^4042657 is an apocalyptic number.

It is an amenable number.

4042657 is a deficient number, since it is larger than the sum of its proper divisors (113621).

4042657 is an equidigital number, since it uses as much as digits as its factorization.

4042657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3027 (or 2990 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 4042657 is about 2010.6359690406. The cubic root of 4042657 is about 159.3023925067.

The spelling of 4042657 in words is "four million, forty-two thousand, six hundred fifty-seven".