30393681 has 4 divisors (see below), whose sum is σ = 40524912. Its totient is φ = 20262452.

The previous prime is 30393667. The next prime is 30393683. The reversal of 30393681 is 18639303.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18639303 = 3 ⋅6213101.

It is a cyclic number.

It is not a de Polignac number, because 30393681 - 2⁶ = 30393617 is a prime.

It is a super-2 number, since 2×30393681² = 1847551689459522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (30393683) 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, 5065611 + ... + 5065616.

It is an arithmetic number, because the mean of its divisors is an integer number (10131228).

Almost surely, 2^30393681 is an apocalyptic number.

It is an amenable number.

30393681 is a deficient number, since it is larger than the sum of its proper divisors (10131231).

30393681 is a wasteful number, since it uses less digits than its factorization.

30393681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10131230.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 30393681 is about 5513.0464355019. The cubic root of 30393681 is about 312.0765242110.

The spelling of 30393681 in words is "thirty million, three hundred ninety-three thousand, six hundred eighty-one".