31240430 has 32 divisors (see below), whose sum is σ = 61858944. Its totient is φ = 11287296.

The previous prime is 31240399. The next prime is 31240439. The reversal of 31240430 is 3404213.

It is a junction number, because it is equal to n+sod(n) for n = 31240399 and 31240408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31240439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3554 + ... + 8666.

It is an arithmetic number, because the mean of its divisors is an integer number (1933092).

Almost surely, 2^31240430 is an apocalyptic number.

31240430 is a deficient number, since it is larger than the sum of its proper divisors (30618514).

31240430 is a wasteful number, since it uses less digits than its factorization.

31240430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5180.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 31240430 is about 5589.3139113848. The cubic root of 31240430 is about 314.9481060058.

Adding to 31240430 its reverse (3404213), we get a palindrome (34644643).

The spelling of 31240430 in words is "thirty-one million, two hundred forty thousand, four hundred thirty".