417993887 has 4 divisors (see below), whose sum is σ = 418121256. Its totient is φ = 417866520.

The previous prime is 417993869. The next prime is 417993913. The reversal of 417993887 is 788399714.

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 417993887 - 2¹⁴ = 417977503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (417993857) 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, 58628 + ... + 65369.

It is an arithmetic number, because the mean of its divisors is an integer number (104530314).

Almost surely, 2^417993887 is an apocalyptic number.

417993887 is a deficient number, since it is larger than the sum of its proper divisors (127369).

417993887 is a wasteful number, since it uses less digits than its factorization.

417993887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127368.

The product of its digits is 3048192, while the sum is 56.

The square root of 417993887 is about 20444.8988014125. The cubic root of 417993887 is about 747.6929920806.

The spelling of 417993887 in words is "four hundred seventeen million, nine hundred ninety-three thousand, eight hundred eighty-seven".