31243430 has 16 divisors (see below), whose sum is σ = 58683744. Its totient is φ = 11953920.

The previous prime is 31243427. The next prime is 31243439. The reversal of 31243430 is 3434213.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31243439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67691 + ... + 68150.

It is an arithmetic number, because the mean of its divisors is an integer number (3667734).

Almost surely, 2^31243430 is an apocalyptic number.

31243430 is a deficient number, since it is larger than the sum of its proper divisors (27440314).

31243430 is a wasteful number, since it uses less digits than its factorization.

31243430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135871.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 31243430 is about 5589.5822741955. The cubic root of 31243430 is about 314.9581871098.

Adding to 31243430 its reverse (3434213), we get a palindrome (34677643).

The spelling of 31243430 in words is "thirty-one million, two hundred forty-three thousand, four hundred thirty".