1500409 has 2 divisors, whose sum is σ = 1500410. Its totient is φ = 1500408.

The previous prime is 1500407. The next prime is 1500413. The reversal of 1500409 is 9040051.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1432809 + 67600 = 1197^2 + 260^2 .

It is a cyclic number.

It is not a de Polignac number, because 1500409 - 2¹ = 1500407 is a prime.

Together with 1500407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1500407) by changing a digit.

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 as a sum of consecutive naturals, namely, 750204 + 750205.

It is an arithmetic number, because the mean of its divisors is an integer number (750205).

2^1500409 is an apocalyptic number.

It is an amenable number.

1500409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1500409 is an equidigital number, since it uses as much as digits as its factorization.

1500409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1500409 is about 1224.9118335619. The cubic root of 1500409 is about 114.4818274904.

The spelling of 1500409 in words is "one million, five hundred thousand, four hundred nine".