42686451 has 6 divisors (see below), whose sum is σ = 61658220. Its totient is φ = 28457628.

The previous prime is 42686443. The next prime is 42686467. The reversal of 42686451 is 15468624.

42686451 is a `hidden beast` number, since 4 + 2 + 6 + 8 + 645 + 1 = 666.

It is not a de Polignac number, because 42686451 - 2³ = 42686443 is a prime.

It is a super-3 number, since 3×42686451³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (42686431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2371461 + ... + 2371478.

It is an arithmetic number, because the mean of its divisors is an integer number (10276370).

Almost surely, 2^42686451 is an apocalyptic number.

42686451 is a deficient number, since it is larger than the sum of its proper divisors (18971769).

42686451 is a wasteful number, since it uses less digits than its factorization.

42686451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4742945 (or 4742942 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 42686451 is about 6533.4868944538. The cubic root of 42686451 is about 349.4861875708.

The spelling of 42686451 in words is "forty-two million, six hundred eighty-six thousand, four hundred fifty-one".