42215457 has 8 divisors (see below), whose sum is σ = 56318976. Its totient is φ = 28127792.

The previous prime is 42215449. The next prime is 42215479. The reversal of 42215457 is 75451224.

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 42215457 - 2³ = 42215449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42215497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5443 + ... + 10679.

It is an arithmetic number, because the mean of its divisors is an integer number (7039872).

Almost surely, 2^42215457 is an apocalyptic number.

It is an amenable number.

42215457 is a deficient number, since it is larger than the sum of its proper divisors (14103519).

42215457 is a wasteful number, since it uses less digits than its factorization.

42215457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7927.

The product of its digits is 11200, while the sum is 30.

The square root of 42215457 is about 6497.3423028189. The cubic root of 42215457 is about 348.1960432588.

The spelling of 42215457 in words is "forty-two million, two hundred fifteen thousand, four hundred fifty-seven".