407991287 has 8 divisors (see below), whose sum is σ = 455937552. Its totient is φ = 361854400.

The previous prime is 407991257. The next prime is 407991293. The reversal of 407991287 is 782199704.

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

It is a cyclic number.

It is not a de Polignac number, because 407991287 - 2¹⁰ = 407990263 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 (407991257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 451868 + ... + 452769.

It is an arithmetic number, because the mean of its divisors is an integer number (56992194).

Almost surely, 2^407991287 is an apocalyptic number.

407991287 is a deficient number, since it is larger than the sum of its proper divisors (47946265).

407991287 is a wasteful number, since it uses less digits than its factorization.

407991287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904689.

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 407991287 is about 20198.7941966841. The cubic root of 407991287 is about 741.6806741509.

The spelling of 407991287 in words is "four hundred seven million, nine hundred ninety-one thousand, two hundred eighty-seven".