30406231 has 4 divisors (see below), whose sum is σ = 30791200. Its totient is φ = 30021264.

The previous prime is 30406171. The next prime is 30406237. The reversal of 30406231 is 13260403.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 30406231 - 2¹⁵ = 30373463 is a prime.

It is a super-2 number, since 2×30406231² = 1849077767250722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30406199 and 30406208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30406237) 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, 192366 + ... + 192523.

It is an arithmetic number, because the mean of its divisors is an integer number (7697800).

Almost surely, 2^30406231 is an apocalyptic number.

30406231 is a deficient number, since it is larger than the sum of its proper divisors (384969).

30406231 is an equidigital number, since it uses as much as digits as its factorization.

30406231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384968.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 30406231 is about 5514.1845271989. The cubic root of 30406231 is about 312.1194719697.

Adding to 30406231 its reverse (13260403), we get a palindrome (43666634).

The spelling of 30406231 in words is "thirty million, four hundred six thousand, two hundred thirty-one".