1247985 has 12 divisors (see below), whose sum is σ = 2163252. Its totient is φ = 665568.

The previous prime is 1247969. The next prime is 1248001. The reversal of 1247985 is 5897421.

It is an interprime number because it is at equal distance from previous prime (1247969) and next prime (1248001).

It can be written as a sum of positive squares in 2 ways, for example, as 349281 + 898704 = 591^2 + 948^2 .

It is not a de Polignac number, because 1247985 - 2⁴ = 1247969 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13822 + ... + 13911.

It is an arithmetic number, because the mean of its divisors is an integer number (180271).

2^1247985 is an apocalyptic number.

1247985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1247985 is a deficient number, since it is larger than the sum of its proper divisors (915267).

1247985 is a wasteful number, since it uses less digits than its factorization.

1247985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27744 (or 27741 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 1247985 is about 1117.1324899044. The cubic root of 1247985 is about 107.6638208929.

The spelling of 1247985 in words is "one million, two hundred forty-seven thousand, nine hundred eighty-five".