30897813 has 8 divisors (see below), whose sum is σ = 41223168. Its totient is φ = 20585504.

The previous prime is 30897803. The next prime is 30897817. The reversal of 30897813 is 31879803.

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

It is a cyclic number.

It is not a de Polignac number, because 30897813 - 2⁶ = 30897749 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30897817) 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, 6145 + ... + 9977.

It is an arithmetic number, because the mean of its divisors is an integer number (5152896).

Almost surely, 2^30897813 is an apocalyptic number.

It is an amenable number.

30897813 is a deficient number, since it is larger than the sum of its proper divisors (10325355).

30897813 is a wasteful number, since it uses less digits than its factorization.

30897813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6523.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 30897813 is about 5558.5801244562. The cubic root of 30897813 is about 313.7925150981.

The spelling of 30897813 in words is "thirty million, eight hundred ninety-seven thousand, eight hundred thirteen".