42940687 has 4 divisors (see below), whose sum is σ = 43484320. Its totient is φ = 42397056.

The previous prime is 42940679. The next prime is 42940693. The reversal of 42940687 is 78604924.

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

It is a cyclic number.

It is not a de Polignac number, because 42940687 - 2³ = 42940679 is a prime.

It is a super-3 number, since 3×42940687³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42940697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271698 + ... + 271855.

It is an arithmetic number, because the mean of its divisors is an integer number (10871080).

Almost surely, 2^42940687 is an apocalyptic number.

42940687 is a deficient number, since it is larger than the sum of its proper divisors (543633).

42940687 is an equidigital number, since it uses as much as digits as its factorization.

42940687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543632.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 42940687 is about 6552.9143897963. The cubic root of 42940687 is about 350.1786489336.

The spelling of 42940687 in words is "forty-two million, nine hundred forty thousand, six hundred eighty-seven".