31340140 has 24 divisors (see below), whose sum is σ = 70877520. Its totient is φ = 11571648.

The previous prime is 31340093. The next prime is 31340143. The reversal of 31340140 is 4104313.

It is not an unprimeable number, because it can be changed into a prime (31340143) 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, 60010 + ... + 60529.

It is an arithmetic number, because the mean of its divisors is an integer number (2953230).

Almost surely, 2^31340140 is an apocalyptic number.

It is an amenable number.

31340140 is an abundant number, since it is smaller than the sum of its proper divisors (39537380).

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

31340140 is a wasteful number, since it uses less digits than its factorization.

31340140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120561 (or 120559 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 31340140 is about 5598.2265048853. The cubic root of 31340140 is about 315.2828231723.

Adding to 31340140 its reverse (4104313), we get a palindrome (35444453).

The spelling of 31340140 in words is "thirty-one million, three hundred forty thousand, one hundred forty".