42407561 has 8 divisors (see below), whose sum is σ = 50573184. Its totient is φ = 34768800.

The previous prime is 42407557. The next prime is 42407569. The reversal of 42407561 is 16570424.

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

It is a cyclic number.

It is not a de Polignac number, because 42407561 - 2² = 42407557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42407569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131540 + ... + 131861.

It is an arithmetic number, because the mean of its divisors is an integer number (6321648).

Almost surely, 2^42407561 is an apocalyptic number.

It is an amenable number.

42407561 is a deficient number, since it is larger than the sum of its proper divisors (8165623).

42407561 is a wasteful number, since it uses less digits than its factorization.

42407561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263431.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 42407561 is about 6512.1087982312. The cubic root of 42407561 is about 348.7234065444.

Adding to 42407561 its reverse (16570424), we get a palindrome (58977985).

The spelling of 42407561 in words is "forty-two million, four hundred seven thousand, five hundred sixty-one".