40243481 has 4 divisors (see below), whose sum is σ = 40599732. Its totient is φ = 39887232.

The previous prime is 40243477. The next prime is 40243499. The reversal of 40243481 is 18434204.

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 16321600 + 23921881 = 4040^2 + 4891^2 .

It is a cyclic number.

It is not a de Polignac number, because 40243481 - 2² = 40243477 is a prime.

It is a super-2 number, since 2×40243481² = 3239075525994722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40243481.

It is not an unprimeable number, because it can be changed into a prime (40243681) 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, 177956 + ... + 178181.

It is an arithmetic number, because the mean of its divisors is an integer number (10149933).

Almost surely, 2^40243481 is an apocalyptic number.

It is an amenable number.

40243481 is a deficient number, since it is larger than the sum of its proper divisors (356251).

40243481 is a wasteful number, since it uses less digits than its factorization.

40243481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356250.

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 40243481 is about 6343.7749802464. The cubic root of 40243481 is about 342.6876972151.

Adding to 40243481 its reverse (18434204), we get a palindrome (58677685).

The spelling of 40243481 in words is "forty million, two hundred forty-three thousand, four hundred eighty-one".