42642461 has 4 divisors (see below), whose sum is σ = 43082172. Its totient is φ = 42202752.

The previous prime is 42642401. The next prime is 42642473. The reversal of 42642461 is 16424624.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33756100 + 8886361 = 5810^2 + 2981^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42642461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42642401) 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, 219710 + ... + 219903.

It is an arithmetic number, because the mean of its divisors is an integer number (10770543).

Almost surely, 2^42642461 is an apocalyptic number.

It is an amenable number.

42642461 is a deficient number, since it is larger than the sum of its proper divisors (439711).

42642461 is an equidigital number, since it uses as much as digits as its factorization.

42642461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439710.

The product of its digits is 9216, while the sum is 29.

The square root of 42642461 is about 6530.1195241741. The cubic root of 42642461 is about 349.3660934021.

The spelling of 42642461 in words is "forty-two million, six hundred forty-two thousand, four hundred sixty-one".