40531220 has 24 divisors (see below), whose sum is σ = 86723784. Its totient is φ = 15906176.

The previous prime is 40531217. The next prime is 40531259. The reversal of 40531220 is 2213504.

It can be written as a sum of positive squares in 4 ways, for example, as 7376656 + 33154564 = 2716^2 + 5758^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18059 + ... + 20178.

It is an arithmetic number, because the mean of its divisors is an integer number (3613491).

Almost surely, 2^40531220 is an apocalyptic number.

It is an amenable number.

40531220 is an abundant number, since it is smaller than the sum of its proper divisors (46192564).

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

40531220 is a wasteful number, since it uses less digits than its factorization.

40531220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38299 (or 38297 counting only the distinct ones).

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

The square root of 40531220 is about 6366.4134330092. The cubic root of 40531220 is about 343.5024920241.

Adding to 40531220 its reverse (2213504), we get a palindrome (42744724).

The spelling of 40531220 in words is "forty million, five hundred thirty-one thousand, two hundred twenty".