42638686 has 8 divisors (see below), whose sum is σ = 67720320. Its totient is φ = 20065248.

The previous prime is 42638663. The next prime is 42638693. The reversal of 42638686 is 68683624.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 627006 + ... + 627073.

It is an arithmetic number, because the mean of its divisors is an integer number (8465040).

Almost surely, 2^42638686 is an apocalyptic number.

42638686 is a deficient number, since it is larger than the sum of its proper divisors (25081634).

42638686 is a wasteful number, since it uses less digits than its factorization.

42638686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1254098.

The product of its digits is 331776, while the sum is 43.

The square root of 42638686 is about 6529.8304725314. The cubic root of 42638686 is about 349.3557836788.

The spelling of 42638686 in words is "forty-two million, six hundred thirty-eight thousand, six hundred eighty-six".