31144230 has 128 divisors (see below), whose sum is σ = 94348800. Its totient is φ = 7247232.

The previous prime is 31144207. The next prime is 31144241. The reversal of 31144230 is 3244113.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 66457 + ... + 66923.

It is an arithmetic number, because the mean of its divisors is an integer number (737100).

Almost surely, 2^31144230 is an apocalyptic number.

31144230 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31144230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47174400).

31144230 is an abundant number, since it is smaller than the sum of its proper divisors (63204570).

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

31144230 is a wasteful number, since it uses less digits than its factorization.

31144230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515 (or 509 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31144230 is about 5580.7015687994. The cubic root of 31144230 is about 314.6244958588.

Adding to 31144230 its reverse (3244113), we get a palindrome (34388343).

The spelling of 31144230 in words is "thirty-one million, one hundred forty-four thousand, two hundred thirty".