1540969 has 2 divisors, whose sum is σ = 1540970. Its totient is φ = 1540968.

The previous prime is 1540967. The next prime is 1540997. The reversal of 1540969 is 9690451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 921600 + 619369 = 960^2 + 787^2 .

It is an emirp because it is prime and its reverse (9690451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1540969 - 2¹ = 1540967 is a prime.

It is a super-2 number, since 2×1540969² = 4749170917922, which contains 22 as substring.

Together with 1540967, it forms a pair of twin primes.

1540969 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1540961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770484 + 770485.

It is an arithmetic number, because the mean of its divisors is an integer number (770485).

2^1540969 is an apocalyptic number.

It is an amenable number.

1540969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540969 is an equidigital number, since it uses as much as digits as its factorization.

1540969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 1540969 is about 1241.3577244292. The cubic root of 1540969 is about 115.5042507634.

The spelling of 1540969 in words is "one million, five hundred forty thousand, nine hundred sixty-nine".