40240420 has 48 divisors (see below), whose sum is σ = 93151296. Its totient is φ = 14480000.

The previous prime is 40240399. The next prime is 40240427. The reversal of 40240420 is 2404204.

It is a junction number, because it is equal to n+sod(n) for n = 40240394 and 40240403.

It is not an unprimeable number, because it can be changed into a prime (40240427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21315 + ... + 23125.

It is an arithmetic number, because the mean of its divisors is an integer number (1940652).

Almost surely, 2^40240420 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 40240420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46575648).

40240420 is an abundant number, since it is smaller than the sum of its proper divisors (52910876).

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

40240420 is a wasteful number, since it uses less digits than its factorization.

40240420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1932 (or 1930 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 40240420 is about 6343.5337155248. The cubic root of 40240420 is about 342.6790084899.

Adding to 40240420 its reverse (2404204), we get a palindrome (42644624).

The spelling of 40240420 in words is "forty million, two hundred forty thousand, four hundred twenty".