851487 has 16 divisors (see below), whose sum is σ = 1397760. Its totient is φ = 448992.

The previous prime is 851471. The next prime is 851491. The reversal of 851487 is 784158.

It is a happy number.

It is not a de Polignac number, because 851487 - 2⁴ = 851471 is a prime.

It is a super-2 number, since 2×851487² = 1450060222338, which contains 22 as substring.

It is a zygodrome in base 2.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 851487.

It is not an unprimeable number, because it can be changed into a prime (851087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1287 + ... + 1832.

It is an arithmetic number, because the mean of its divisors is an integer number (87360).

2⁸⁵¹⁴⁸⁷ is an apocalyptic number.

851487 is a deficient number, since it is larger than the sum of its proper divisors (546273).

851487 is a wasteful number, since it uses less digits than its factorization.

851487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3142.

The product of its digits is 8960, while the sum is 33.

The square root of 851487 is about 922.7605323159. The cubic root of 851487 is about 94.7820302780.

The spelling of 851487 in words is "eight hundred fifty-one thousand, four hundred eighty-seven".