42809386 has 8 divisors (see below), whose sum is σ = 65580480. Its totient is φ = 20949228.

The previous prime is 42809363. The next prime is 42809471. The reversal of 42809386 is 68390824.

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 227616 + ... + 227803.

It is an arithmetic number, because the mean of its divisors is an integer number (8197560).

Almost surely, 2^42809386 is an apocalyptic number.

42809386 is a deficient number, since it is larger than the sum of its proper divisors (22771094).

42809386 is a wasteful number, since it uses less digits than its factorization.

42809386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455468.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 42809386 is about 6542.8882001758. Note that the first 3 decimals coincide. The cubic root of 42809386 is about 349.8213673486.

The spelling of 42809386 in words is "forty-two million, eight hundred nine thousand, three hundred eighty-six".