30431421 has 6 divisors (see below), whose sum is σ = 43956510. Its totient is φ = 20287608.

The previous prime is 30431417. The next prime is 30431441. The reversal of 30431421 is 12413403.

It can be written as a sum of positive squares in only one way, i.e., 30404196 + 27225 = 5514^2 + 165^2 .

It is not a de Polignac number, because 30431421 - 2² = 30431417 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 30431394 and 30431403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30431441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1690626 + ... + 1690643.

It is an arithmetic number, because the mean of its divisors is an integer number (7326085).

Almost surely, 2^30431421 is an apocalyptic number.

It is an amenable number.

30431421 is a deficient number, since it is larger than the sum of its proper divisors (13525089).

30431421 is a wasteful number, since it uses less digits than its factorization.

30431421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3381275 (or 3381272 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 30431421 is about 5516.4681635989. The cubic root of 30431421 is about 312.2056398271.

Adding to 30431421 its reverse (12413403), we get a palindrome (42844824).

The spelling of 30431421 in words is "thirty million, four hundred thirty-one thousand, four hundred twenty-one".