1247521 has 16 divisors (see below), whose sum is σ = 1474560. Its totient is φ = 1043280.

The previous prime is 1247509. The next prime is 1247527. The reversal of 1247521 is 1257421.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1247521 - 2⁹ = 1247009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1247492 and 1247501.

It is not an unprimeable number, because it can be changed into a prime (1247527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9760 + ... + 9886.

It is an arithmetic number, because the mean of its divisors is an integer number (92160).

2^1247521 is an apocalyptic number.

1247521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1247521 is a deficient number, since it is larger than the sum of its proper divisors (227039).

1247521 is a wasteful number, since it uses less digits than its factorization.

1247521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204.

The product of its digits is 560, while the sum is 22.

The square root of 1247521 is about 1116.9247960360. The cubic root of 1247521 is about 107.6504761263.

The spelling of 1247521 in words is "one million, two hundred forty-seven thousand, five hundred twenty-one".