• 309649² = 95882503201 is an anagram of the next square 309650² = 95883122500.

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309649 has 4 divisors (see below), whose sum is σ = 323136. Its totient is φ = 296164.

The previous prime is 309637. The next prime is 309667. The reversal of 309649 is 946903.

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 309649 - 2⁷ = 309521 is a prime.

It is a Duffinian number.

309649 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 309649.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309629) 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, 6709 + ... + 6754.

It is an arithmetic number, because the mean of its divisors is an integer number (80784).

2³⁰⁹⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

309649 is a deficient number, since it is larger than the sum of its proper divisors (13487).

309649 is a wasteful number, since it uses less digits than its factorization.

309649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13486.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 309649 is about 556.4611397034. The cubic root of 309649 is about 67.6534415120.

The spelling of 309649 in words is "three hundred nine thousand, six hundred forty-nine".