309020386 has 8 divisors (see below), whose sum is σ = 465555420. Its totient is φ = 153835248.

The previous prime is 309020381. The next prime is 309020401. The reversal of 309020386 is 683020903.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 204347025 + 104673361 = 14295^2 + 10231^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (309020381) 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, 336901 + ... + 337816.

Almost surely, 2^309020386 is an apocalyptic number.

309020386 is a deficient number, since it is larger than the sum of its proper divisors (156535034).

309020386 is a wasteful number, since it uses less digits than its factorization.

309020386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674948.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 309020386 is about 17578.9756811937. The cubic root of 309020386 is about 676.0762973650.

The spelling of 309020386 in words is "three hundred nine million, twenty thousand, three hundred eighty-six".