1305869 has 2 divisors, whose sum is σ = 1305870. Its totient is φ = 1305868.

The previous prime is 1305823. The next prime is 1305881. The reversal of 1305869 is 9685031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 990025 + 315844 = 995^2 + 562^2 .

It is a cyclic number.

It is not a de Polignac number, because 1305869 - 2¹⁶ = 1240333 is a prime.

It is a super-2 number, since 2×1305869² = 3410587690322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1305169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652934 + 652935.

It is an arithmetic number, because the mean of its divisors is an integer number (652935).

2^1305869 is an apocalyptic number.

It is an amenable number.

1305869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1305869 is an equidigital number, since it uses as much as digits as its factorization.

1305869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 1305869 is about 1142.7462535489. The cubic root of 1305869 is about 109.3032823997.

The spelling of 1305869 in words is "one million, three hundred five thousand, eight hundred sixty-nine".