287491407 has 16 divisors (see below), whose sum is σ = 438431232. Its totient is φ = 164149920.

The previous prime is 287491387. The next prime is 287491441. The reversal of 287491407 is 704194782.

It is a happy number.

It is not a de Polignac number, because 287491407 - 2⁷ = 287491279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287491487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25657 + ... + 35117.

It is an arithmetic number, because the mean of its divisors is an integer number (27401952).

Almost surely, 2^287491407 is an apocalyptic number.

287491407 is a deficient number, since it is larger than the sum of its proper divisors (150939825).

287491407 is a wasteful number, since it uses less digits than its factorization.

287491407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10918.

The product of its (nonzero) digits is 112896, while the sum is 42.

The square root of 287491407 is about 16955.5715621739. The cubic root of 287491407 is about 659.9964852889.

The spelling of 287491407 in words is "two hundred eighty-seven million, four hundred ninety-one thousand, four hundred seven".