1285491 has 12 divisors (see below), whose sum is σ = 1767192. Its totient is φ = 831168.

The previous prime is 1285481. The next prime is 1285507. The reversal of 1285491 is 1945821.

It is a happy number.

It is not a de Polignac number, because 1285491 - 2¹⁰ = 1284467 is a prime.

It is a super-2 number, since 2×1285491² = 3304974222162, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (1285411) 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 11 ways as a sum of consecutive naturals, for example, 3951 + ... + 4263.

It is an arithmetic number, because the mean of its divisors is an integer number (147266).

2^1285491 is an apocalyptic number.

1285491 is a deficient number, since it is larger than the sum of its proper divisors (481701).

1285491 is an equidigital number, since it uses as much as digits as its factorization.

1285491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390 (or 353 counting only the distinct ones).

The product of its digits is 2880, while the sum is 30.

The square root of 1285491 is about 1133.7949550073. The cubic root of 1285491 is about 108.7317422117.

The spelling of 1285491 in words is "one million, two hundred eighty-five thousand, four hundred ninety-one".