421671787 has 4 divisors (see below), whose sum is σ = 421746696. Its totient is φ = 421596880.

The previous prime is 421671773. The next prime is 421671793. The reversal of 421671787 is 787176124.

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 421671787 - 2²³ = 413283179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421671727) 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, 28258 + ... + 40519.

It is an arithmetic number, because the mean of its divisors is an integer number (105436674).

Almost surely, 2^421671787 is an apocalyptic number.

421671787 is a deficient number, since it is larger than the sum of its proper divisors (74909).

421671787 is an equidigital number, since it uses as much as digits as its factorization.

421671787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74908.

The product of its digits is 131712, while the sum is 43.

The square root of 421671787 is about 20534.6484508501. The cubic root of 421671787 is about 749.8795581409.

The spelling of 421671787 in words is "four hundred twenty-one million, six hundred seventy-one thousand, seven hundred eighty-seven".