1023309 has 24 divisors (see below), whose sum is σ = 1738880. Its totient is φ = 567648.

The previous prime is 1023301. The next prime is 1023311. The reversal of 1023309 is 9033201.

It is not a de Polignac number, because 1023309 - 2³ = 1023301 is a prime.

It is a super-2 number, since 2×1023309² = 2094322618962, which contains 22 as substring.

It is a Duffinian number.

1023309 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1023291 and 1023300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023301) 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 in 23 ways as a sum of consecutive naturals, for example, 2112 + ... + 2550.

2^1023309 is an apocalyptic number.

It is an amenable number.

1023309 is a deficient number, since it is larger than the sum of its proper divisors (715571).

1023309 is a wasteful number, since it uses less digits than its factorization.

1023309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 486 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 1023309 is about 1011.5873664692. The cubic root of 1023309 is about 100.7710068731.

The spelling of 1023309 in words is "one million, twenty-three thousand, three hundred nine".