356309 has 4 divisors (see below), whose sum is σ = 357504. Its totient is φ = 355116.

The previous prime is 356299. The next prime is 356311. The reversal of 356309 is 903653.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 903653 = 809 ⋅1117.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-356309 is a prime.

It is a super-2 number, since 2×356309² = 253912206962, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (356399) 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 3 ways as a sum of consecutive naturals, for example, 284 + ... + 890.

It is an arithmetic number, because the mean of its divisors is an integer number (89376).

2³⁵⁶³⁰⁹ is an apocalyptic number.

It is an amenable number.

356309 is a deficient number, since it is larger than the sum of its proper divisors (1195).

356309 is an equidigital number, since it uses as much as digits as its factorization.

356309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1194.

The product of its (nonzero) digits is 2430, while the sum is 26.

The square root of 356309 is about 596.9162420307. The cubic root of 356309 is about 70.8939101943.

The spelling of 356309 in words is "three hundred fifty-six thousand, three hundred nine".