30120381 has 6 divisors (see below), whose sum is σ = 43507230. Its totient is φ = 20080248.

The previous prime is 30120361. The next prime is 30120383. The reversal of 30120381 is 18302103.

It can be written as a sum of positive squares in only one way, i.e., 20848356 + 9272025 = 4566^2 + 3045^2 .

It is not a de Polignac number, because 30120381 - 2²² = 25926077 is a prime.

It is a super-2 number, since 2×30120381² = 1814474703170322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30120383) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1673346 + ... + 1673363.

It is an arithmetic number, because the mean of its divisors is an integer number (7251205).

Almost surely, 2^30120381 is an apocalyptic number.

It is an amenable number.

30120381 is a deficient number, since it is larger than the sum of its proper divisors (13386849).

30120381 is a wasteful number, since it uses less digits than its factorization.

30120381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3346715 (or 3346712 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 30120381 is about 5488.2038045248. The cubic root of 30120381 is about 311.1383089837.

Adding to 30120381 its reverse (18302103), we get a palindrome (48422484).

The spelling of 30120381 in words is "thirty million, one hundred twenty thousand, three hundred eighty-one".