40231220 has 12 divisors (see below), whose sum is σ = 84485604. Its totient is φ = 16092480.

The previous prime is 40231199. The next prime is 40231237. The reversal of 40231220 is 2213204.

It can be written as a sum of positive squares in 2 ways, for example, as 25684624 + 14546596 = 5068^2 + 3814^2 .

It is a junction number, because it is equal to n+sod(n) for n = 40231195 and 40231204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1005761 + ... + 1005800.

It is an arithmetic number, because the mean of its divisors is an integer number (7040467).

Almost surely, 2^40231220 is an apocalyptic number.

It is an amenable number.

40231220 is an abundant number, since it is smaller than the sum of its proper divisors (44254384).

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

40231220 is a wasteful number, since it uses less digits than its factorization.

40231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011570 (or 2011568 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 40231220 is about 6342.8085261972. The cubic root of 40231220 is about 342.6528914069.

Adding to 40231220 its reverse (2213204), we get a palindrome (42444424).

The spelling of 40231220 in words is "forty million, two hundred thirty-one thousand, two hundred twenty".