30139209 has 20 divisors (see below), whose sum is σ = 45575376. Its totient is φ = 19846296.

The previous prime is 30139199. The next prime is 30139229. The reversal of 30139209 is 90293103.

It is not a de Polignac number, because 30139209 - 2¹² = 30135113 is a prime.

It is a super-3 number, since 3×30139209³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (30139229) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4482 + ... + 8964.

Almost surely, 2^30139209 is an apocalyptic number.

It is an amenable number.

30139209 is a deficient number, since it is larger than the sum of its proper divisors (15436167).

30139209 is an equidigital number, since it uses as much as digits as its factorization.

30139209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4578 (or 4569 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 30139209 is about 5489.9188518593. The cubic root of 30139209 is about 311.2031254711.

The spelling of 30139209 in words is "thirty million, one hundred thirty-nine thousand, two hundred nine".