1025309 has 4 divisors (see below), whose sum is σ = 1029216. Its totient is φ = 1021404.

The previous prime is 1025303. The next prime is 1025327. The reversal of 1025309 is 9035201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1025309 - 2¹⁶ = 959773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025303) 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, 1529 + ... + 2094.

It is an arithmetic number, because the mean of its divisors is an integer number (257304).

2^1025309 is an apocalyptic number.

It is an amenable number.

1025309 is a deficient number, since it is larger than the sum of its proper divisors (3907).

1025309 is an equidigital number, since it uses as much as digits as its factorization.

1025309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3906.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 1025309 is about 1012.5754292891. The cubic root of 1025309 is about 100.8366145750.

The spelling of 1025309 in words is "one million, twenty-five thousand, three hundred nine".