31122140 has 96 divisors (see below), whose sum is σ = 78962688. Its totient is φ = 10080000.

The previous prime is 31122101. The next prime is 31122173. The reversal of 31122140 is 4122113.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 308090 + ... + 308190.

It is an arithmetic number, because the mean of its divisors is an integer number (822528).

Almost surely, 2^31122140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31122140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39481344).

31122140 is an abundant number, since it is smaller than the sum of its proper divisors (47840548).

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

31122140 is a wasteful number, since it uses less digits than its factorization.

31122140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 31122140 is about 5578.7220758880. The cubic root of 31122140 is about 314.5500925751.

Adding to 31122140 its reverse (4122113), we get a palindrome (35244253).

The spelling of 31122140 in words is "thirty-one million, one hundred twenty-two thousand, one hundred forty".