42691787 has 8 divisors (see below), whose sum is σ = 43769520. Its totient is φ = 41627520.

The previous prime is 42691771. The next prime is 42691801. The reversal of 42691787 is 78719624.

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

It is not a de Polignac number, because 42691787 - 2⁴ = 42691771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42691717) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3212 + ... + 9782.

It is an arithmetic number, because the mean of its divisors is an integer number (5471190).

Almost surely, 2^42691787 is an apocalyptic number.

42691787 is a deficient number, since it is larger than the sum of its proper divisors (1077733).

42691787 is an equidigital number, since it uses as much as digits as its factorization.

42691787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6733.

The product of its digits is 169344, while the sum is 44.

The square root of 42691787 is about 6533.8952394418. The cubic root of 42691787 is about 349.5007494170.

The spelling of 42691787 in words is "forty-two million, six hundred ninety-one thousand, seven hundred eighty-seven".