30409381 has 4 divisors (see below), whose sum is σ = 31731552. Its totient is φ = 29087212.

The previous prime is 30409369. The next prime is 30409387. The reversal of 30409381 is 18390403.

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.

It is a cyclic number.

It is not a de Polignac number, because 30409381 - 2⁵ = 30409349 is a prime.

It is a super-2 number, since 2×30409381² = 1849460905606322, 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 (30409387) 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, 661051 + ... + 661096.

It is an arithmetic number, because the mean of its divisors is an integer number (7932888).

Almost surely, 2^30409381 is an apocalyptic number.

It is an amenable number.

30409381 is a deficient number, since it is larger than the sum of its proper divisors (1322171).

30409381 is a wasteful number, since it uses less digits than its factorization.

30409381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322170.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 30409381 is about 5514.4701468047. The cubic root of 30409381 is about 312.1302498306.

Adding to 30409381 its reverse (18390403), we get a palindrome (48799784).

It can be divided in two parts, 3040 and 9381, that added together give a palindrome (12421).

The spelling of 30409381 in words is "thirty million, four hundred nine thousand, three hundred eighty-one".