42406685 has 8 divisors (see below), whose sum is σ = 50945976. Its totient is φ = 33886720.

The previous prime is 42406657. The next prime is 42406709. The reversal of 42406685 is 58660424.

It can be written as a sum of positive squares in 4 ways, for example, as 20232004 + 22174681 = 4498^2 + 4709^2 .

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

It is not a de Polignac number, because 42406685 - 2⁶ = 42406621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 545 + ... + 9225.

It is an arithmetic number, because the mean of its divisors is an integer number (6368247).

Almost surely, 2^42406685 is an apocalyptic number.

It is an amenable number.

42406685 is a deficient number, since it is larger than the sum of its proper divisors (8539291).

42406685 is an equidigital number, since it uses as much as digits as its factorization.

42406685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9663.

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 42406685 is about 6512.0415385653. The cubic root of 42406685 is about 348.7210053703.

The spelling of 42406685 in words is "forty-two million, four hundred six thousand, six hundred eighty-five".