30769209 has 15 divisors (see below), whose sum is σ = 45502613. Its totient is φ = 20035764.

The previous prime is 30769187. The next prime is 30769217. The reversal of 30769209 is 90296703.

The square root of 30769209 is 5547.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 30769209 - 2⁵ = 30769177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30769259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 715542 + ... + 715584.

Almost surely, 2^30769209 is an apocalyptic number.

30769209 is the 5547-th square number.

30769209 is the 2774-th centered octagonal number.

It is an amenable number.

30769209 is a deficient number, since it is larger than the sum of its proper divisors (14733404).

30769209 is an frugal number, since it uses more digits than its factorization.

30769209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 46 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The cubic root of 30769209 is about 313.3565501382.

Multiplying 30769209 by its sum of digits (36), we get a square (1107691524 = 33282²).

The spelling of 30769209 in words is "thirty million, seven hundred sixty-nine thousand, two hundred nine".