31214240 has 24 divisors (see below), whose sum is σ = 73744020. Its totient is φ = 12485632.

The previous prime is 31214233. The next prime is 31214263. The reversal of 31214240 is 4241213.

It can be written as a sum of positive squares in 2 ways, for example, as 29986576 + 1227664 = 5476^2 + 1108^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97385 + ... + 97704.

Almost surely, 2^31214240 is an apocalyptic number.

It is an amenable number.

31214240 is an abundant number, since it is smaller than the sum of its proper divisors (42529780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31214240 is a wasteful number, since it uses less digits than its factorization.

31214240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195104 (or 195096 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 31214240 is about 5586.9705565718. The cubic root of 31214240 is about 314.8600705447.

Adding to 31214240 its reverse (4241213), we get a palindrome (35455453).

The spelling of 31214240 in words is "thirty-one million, two hundred fourteen thousand, two hundred forty".