491787 has 12 divisors (see below), whose sum is σ = 724464. Its totient is φ = 321360.

The previous prime is 491783. The next prime is 491789. The reversal of 491787 is 787194.

It is not a de Polignac number, because 491787 - 2² = 491783 is a prime.

It is a plaindrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 491787.

It is not an unprimeable number, because it can be changed into a prime (491783) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39 + ... + 992.

It is an arithmetic number, because the mean of its divisors is an integer number (60372).

2⁴⁹¹⁷⁸⁷ is an apocalyptic number.

491787 is a deficient number, since it is larger than the sum of its proper divisors (232677).

491787 is a wasteful number, since it uses less digits than its factorization.

491787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090 (or 1087 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 491787 is about 701.2752669245. The cubic root of 491787 is about 78.9330736926.

The spelling of 491787 in words is "four hundred ninety-one thousand, seven hundred eighty-seven".