1289257 has 4 divisors (see below), whose sum is σ = 1316736. Its totient is φ = 1261780.

The previous prime is 1289237. The next prime is 1289261. The reversal of 1289257 is 7529821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1289257 - 2⁷ = 1289129 is a prime.

It is a super-2 number, since 2×1289257² = 3324367224098, which contains 22 as substring.

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 (1289237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13669 + ... + 13762.

It is an arithmetic number, because the mean of its divisors is an integer number (329184).

2^1289257 is an apocalyptic number.

It is an amenable number.

1289257 is a deficient number, since it is larger than the sum of its proper divisors (27479).

1289257 is an equidigital number, since it uses as much as digits as its factorization.

1289257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27478.

The product of its digits is 10080, while the sum is 34.

The square root of 1289257 is about 1135.4545345367. The cubic root of 1289257 is about 108.8378195817.

The spelling of 1289257 in words is "one million, two hundred eighty-nine thousand, two hundred fifty-seven".