30197381 has 4 divisors (see below), whose sum is σ = 31238700. Its totient is φ = 29156064.

The previous prime is 30197371. The next prime is 30197407. The reversal of 30197381 is 18379103.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18379103 = 43 ⋅427421.

It can be written as a sum of positive squares in 2 ways, for example, as 11621281 + 18576100 = 3409^2 + 4310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30197381 is a prime.

It is a super-2 number, since 2×30197381² = 1823763638518322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30197311) 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, 520616 + ... + 520673.

It is an arithmetic number, because the mean of its divisors is an integer number (7809675).

Almost surely, 2^30197381 is an apocalyptic number.

It is an amenable number.

30197381 is a deficient number, since it is larger than the sum of its proper divisors (1041319).

30197381 is a wasteful number, since it uses less digits than its factorization.

30197381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041318.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 30197381 is about 5495.2143725245. The cubic root of 30197381 is about 311.4032155881.

The spelling of 30197381 in words is "thirty million, one hundred ninety-seven thousand, three hundred eighty-one".