40442861 has 4 divisors (see below), whose sum is σ = 40469724. Its totient is φ = 40416000.

The previous prime is 40442839. The next prime is 40442873. The reversal of 40442861 is 16824404.

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 26522500 + 13920361 = 5150^2 + 3731^2 .

It is a cyclic number.

It is not a de Polignac number, because 40442861 - 2⁶ = 40442797 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 (40442561) 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, 11030 + ... + 14231.

It is an arithmetic number, because the mean of its divisors is an integer number (10117431).

Almost surely, 2^40442861 is an apocalyptic number.

It is an amenable number.

40442861 is a deficient number, since it is larger than the sum of its proper divisors (26863).

40442861 is a wasteful number, since it uses less digits than its factorization.

40442861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26862.

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 40442861 is about 6359.4701823344. The cubic root of 40442861 is about 343.2526959482.

The spelling of 40442861 in words is "forty million, four hundred forty-two thousand, eight hundred sixty-one".