40130081 has 4 divisors (see below), whose sum is σ = 42490692. Its totient is φ = 37769472.

The previous prime is 40130059. The next prime is 40130087. The reversal of 40130081 is 18003104.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21939856 + 18190225 = 4684^2 + 4265^2 .

It is a cyclic number.

It is not a de Polignac number, because 40130081 - 2⁶ = 40130017 is a prime.

It is a super-2 number, since 2×40130081² = 3220846802133122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 2360593 = 40130081 / (4 + 0 + 1 + 3 + 0 + 0 + 8 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40130087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1180280 + ... + 1180313.

It is an arithmetic number, because the mean of its divisors is an integer number (10622673).

Almost surely, 2^40130081 is an apocalyptic number.

It is an amenable number.

40130081 is a deficient number, since it is larger than the sum of its proper divisors (2360611).

40130081 is a wasteful number, since it uses less digits than its factorization.

40130081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2360610.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 40130081 is about 6334.8307791132. The cubic root of 40130081 is about 342.3655138253.

Adding to 40130081 its reverse (18003104), we get a palindrome (58133185).

The spelling of 40130081 in words is "forty million, one hundred thirty thousand, eighty-one".