40121320 has 32 divisors (see below), whose sum is σ = 92716200. Its totient is φ = 15614208.

The previous prime is 40121317. The next prime is 40121321. The reversal of 40121320 is 2312104.

It can be written as a sum of positive squares in 4 ways, for example, as 35736484 + 4384836 = 5978^2 + 2094^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 40121320.

It is not an unprimeable number, because it can be changed into a prime (40121321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12075 + ... + 15034.

Almost surely, 2^40121320 is an apocalyptic number.

40121320 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40121320 is an abundant number, since it is smaller than the sum of its proper divisors (52594880).

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

40121320 is a wasteful number, since it uses less digits than its factorization.

40121320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27157 (or 27153 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 40121320 is about 6334.1392469696. The cubic root of 40121320 is about 342.3405974991.

Adding to 40121320 its reverse (2312104), we get a palindrome (42433424).

The spelling of 40121320 in words is "forty million, one hundred twenty-one thousand, three hundred twenty".