40161280 has 104 divisors (see below), whose sum is σ = 100847592. Its totient is φ = 15335424.

The previous prime is 40161239. The next prime is 40161281. The reversal of 40161280 is 8216104.

It can be written as a sum of positive squares in 4 ways, for example, as 15241216 + 24920064 = 3904^2 + 4992^2 .

It is a super-2 number, since 2×40161280² = 3225856822476800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40161281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 757734 + ... + 757786.

Almost surely, 2^40161280 is an apocalyptic number.

40161280 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40161280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50423796).

40161280 is an abundant number, since it is smaller than the sum of its proper divisors (60686312).

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

40161280 is an equidigital number, since it uses as much as digits as its factorization.

40161280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 40161280 is about 6337.2927974017. The cubic root of 40161280 is about 342.4542144917.

Adding to 40161280 its reverse (8216104), we get a palindrome (48377384).

The spelling of 40161280 in words is "forty million, one hundred sixty-one thousand, two hundred eighty".