40440261 has 4 divisors (see below), whose sum is σ = 53920352. Its totient is φ = 26960172.

The previous prime is 40440259. The next prime is 40440269. The reversal of 40440261 is 16204404.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 40440261 - 2¹ = 40440259 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40440269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6740041 + ... + 6740046.

It is an arithmetic number, because the mean of its divisors is an integer number (13480088).

Almost surely, 2^40440261 is an apocalyptic number.

It is an amenable number.

40440261 is a deficient number, since it is larger than the sum of its proper divisors (13480091).

40440261 is a wasteful number, since it uses less digits than its factorization.

40440261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13480090.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 40440261 is about 6359.2657595040. The cubic root of 40440261 is about 343.2453400876.

Adding to 40440261 its reverse (16204404), we get a palindrome (56644665).

The spelling of 40440261 in words is "forty million, four hundred forty thousand, two hundred sixty-one".