42215438 has 4 divisors (see below), whose sum is σ = 63323160. Its totient is φ = 21107718.

The previous prime is 42215431. The next prime is 42215441. The reversal of 42215438 is 83451224.

It is a happy number.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42215438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42215431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10553858 + ... + 10553861.

It is an arithmetic number, because the mean of its divisors is an integer number (15830790).

Almost surely, 2^42215438 is an apocalyptic number.

42215438 is a deficient number, since it is larger than the sum of its proper divisors (21107722).

42215438 is a wasteful number, since it uses less digits than its factorization.

42215438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21107721.

The product of its digits is 7680, while the sum is 29.

The square root of 42215438 is about 6497.3408406824. The cubic root of 42215438 is about 348.1959910211.

The spelling of 42215438 in words is "forty-two million, two hundred fifteen thousand, four hundred thirty-eight".