40005161 has 4 divisors (see below), whose sum is σ = 45720192. Its totient is φ = 34290132.

The previous prime is 40005157. The next prime is 40005167. The reversal of 40005161 is 16150004.

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 a cyclic number.

It is not a de Polignac number, because 40005161 - 2² = 40005157 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40005167) 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, 2857505 + ... + 2857518.

It is an arithmetic number, because the mean of its divisors is an integer number (11430048).

Almost surely, 2^40005161 is an apocalyptic number.

It is an amenable number.

40005161 is a deficient number, since it is larger than the sum of its proper divisors (5715031).

40005161 is an equidigital number, since it uses as much as digits as its factorization.

40005161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5715030.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 40005161 is about 6324.9633200517. The cubic root of 40005161 is about 342.0098973459.

Adding to 40005161 its reverse (16150004), we get a palindrome (56155165).

The spelling of 40005161 in words is "forty million, five thousand, one hundred sixty-one".