30985709 has 8 divisors (see below), whose sum is σ = 32766720. Its totient is φ = 29253600.

The previous prime is 30985673. The next prime is 30985711. The reversal of 30985709 is 90758903.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30985709 is a prime.

It is a super-2 number, since 2×30985709² = 1920228324465362, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30985729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10919 + ... + 13460.

It is an arithmetic number, because the mean of its divisors is an integer number (4095840).

Almost surely, 2^30985709 is an apocalyptic number.

It is an amenable number.

30985709 is a deficient number, since it is larger than the sum of its proper divisors (1781011).

30985709 is a wasteful number, since it uses less digits than its factorization.

30985709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24451.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 30985709 is about 5566.4808452019. The cubic root of 30985709 is about 314.0897852700.

The spelling of 30985709 in words is "thirty million, nine hundred eighty-five thousand, seven hundred nine".