40555861 has 4 divisors (see below), whose sum is σ = 42690400. Its totient is φ = 38421324.

The previous prime is 40555849. The next prime is 40555873. The reversal of 40555861 is 16855504.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (40555849) and next prime (40555873).

It is a cyclic number.

It is not a de Polignac number, because 40555861 - 2⁷ = 40555733 is a prime.

It is a super-2 number, since 2×40555861² = 3289555722902642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40555841) 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, 1067241 + ... + 1067278.

It is an arithmetic number, because the mean of its divisors is an integer number (10672600).

Almost surely, 2^40555861 is an apocalyptic number.

It is an amenable number.

40555861 is a deficient number, since it is larger than the sum of its proper divisors (2134539).

40555861 is a wasteful number, since it uses less digits than its factorization.

40555861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2134538.

The product of its (nonzero) digits is 24000, while the sum is 34.

The square root of 40555861 is about 6368.3483730085. The cubic root of 40555861 is about 343.5720888288.

The spelling of 40555861 in words is "forty million, five hundred fifty-five thousand, eight hundred sixty-one".