393117487 has 8 divisors (see below), whose sum is σ = 449434400. Its totient is φ = 336839904.

The previous prime is 393117457. The next prime is 393117511. The reversal of 393117487 is 784711393.

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

It is a 5-Lehmer number, since φ(393117487) divides (393117487-1)⁵.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-393117487 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 (393117427) 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, 16189 + ... + 32377.

It is an arithmetic number, because the mean of its divisors is an integer number (56179300).

Almost surely, 2^393117487 is an apocalyptic number.

393117487 is the 16189-th pentagonal number.

393117487 is a deficient number, since it is larger than the sum of its proper divisors (56316913).

393117487 is a wasteful number, since it uses less digits than its factorization.

393117487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19665.

The product of its digits is 127008, while the sum is 43.

The square root of 393117487 is about 19827.1905977625. The cubic root of 393117487 is about 732.5559288990. Note that the first 3 decimals are identical.

The spelling of 393117487 in words is "three hundred ninety-three million, one hundred seventeen thousand, four hundred eighty-seven".