1290749 has 4 divisors (see below), whose sum is σ = 1293564. Its totient is φ = 1287936.

The previous prime is 1290719. The next prime is 1290791. The reversal of 1290749 is 9470921.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1194649 + 96100 = 1093^2 + 310^2 .

It is a cyclic number.

It is not a de Polignac number, because 1290749 - 2¹² = 1286653 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1290719) 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, 542 + ... + 1695.

It is an arithmetic number, because the mean of its divisors is an integer number (323391).

2^1290749 is an apocalyptic number.

It is an amenable number.

1290749 is a deficient number, since it is larger than the sum of its proper divisors (2815).

1290749 is an equidigital number, since it uses as much as digits as its factorization.

1290749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2814.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 1290749 is about 1136.1113501766. Note that the first 3 decimals coincide. The cubic root of 1290749 is about 108.8797877919.

The spelling of 1290749 in words is "one million, two hundred ninety thousand, seven hundred forty-nine".