1290745 has 8 divisors (see below), whose sum is σ = 1590984. Its totient is φ = 1004544.

The previous prime is 1290719. The next prime is 1290791. The reversal of 1290745 is 5470921.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 184041 + 1106704 = 429^2 + 1052^2 .

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 1290745 - 2¹¹ = 1288697 is a prime.

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

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3304 + ... + 3673.

It is an arithmetic number, because the mean of its divisors is an integer number (198873).

2^1290745 is an apocalyptic number.

It is an amenable number.

1290745 is a deficient number, since it is larger than the sum of its proper divisors (300239).

1290745 is an equidigital number, since it uses as much as digits as its factorization.

1290745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7019.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 1290745 is about 1136.1095897844. The cubic root of 1290745 is about 108.8796753199.

Subtracting from 1290745 its product of nonzero digits (2520), we obtain a square (1288225 = 1135²).

The spelling of 1290745 in words is "one million, two hundred ninety thousand, seven hundred forty-five".