1247257 has 8 divisors (see below), whose sum is σ = 1380672. Its totient is φ = 1117200.

The previous prime is 1247243. The next prime is 1247263. The reversal of 1247257 is 7527421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1247257 - 2¹⁵ = 1214489 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (1247297) 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 7 ways as a sum of consecutive naturals, for example, 18 + ... + 1579.

It is an arithmetic number, because the mean of its divisors is an integer number (172584).

2^1247257 is an apocalyptic number.

It is an amenable number.

1247257 is a deficient number, since it is larger than the sum of its proper divisors (133415).

1247257 is a wasteful number, since it uses less digits than its factorization.

1247257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679.

The product of its digits is 3920, while the sum is 28.

The square root of 1247257 is about 1116.8066081466. The cubic root of 1247257 is about 107.6428819374.

It can be divided in two parts, 124 and 7257, that added together give a triangular number (7381 = T₁₂₁).

The spelling of 1247257 in words is "one million, two hundred forty-seven thousand, two hundred fifty-seven".