1290557 has 4 divisors (see below), whose sum is σ = 1322076. Its totient is φ = 1259040.

The previous prime is 1290551. The next prime is 1290563. The reversal of 1290557 is 7550921.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1290551) and next prime (1290563).

It can be written as a sum of positive squares in 2 ways, for example, as 395641 + 894916 = 629^2 + 946^2 .

It is a cyclic number.

It is not a de Polignac number, because 1290557 - 2²⁰ = 241981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1290551) 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, 15698 + ... + 15779.

It is an arithmetic number, because the mean of its divisors is an integer number (330519).

2^1290557 is an apocalyptic number.

It is an amenable number.

1290557 is a deficient number, since it is larger than the sum of its proper divisors (31519).

1290557 is an equidigital number, since it uses as much as digits as its factorization.

1290557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31518.

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 1290557 is about 1136.0268482743. The cubic root of 1290557 is about 108.8743888709.

The spelling of 1290557 in words is "one million, two hundred ninety thousand, five hundred fifty-seven".