31225040 has 160 divisors (see below), whose sum is σ = 93636864. Its totient is φ = 9400320.

The previous prime is 31225031. The next prime is 31225049. The reversal of 31225040 is 4052213.

It is an interprime number because it is at equal distance from previous prime (31225031) and next prime (31225049).

It is a super-3 number, since 3×31225040³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31225049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 227852 + ... + 227988.

Almost surely, 2^31225040 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 31225040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46818432).

31225040 is an abundant number, since it is smaller than the sum of its proper divisors (62411824).

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

31225040 is a wasteful number, since it uses less digits than its factorization.

31225040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 31225040 is about 5587.9370075190. The cubic root of 31225040 is about 314.8963797917.

Adding to 31225040 its reverse (4052213), we get a palindrome (35277253).

It can be divided in two parts, 312 and 25040, that added together give a palindrome (25352).

The spelling of 31225040 in words is "thirty-one million, two hundred twenty-five thousand, forty".