40166861 has 4 divisors (see below), whose sum is σ = 45904992. Its totient is φ = 34428732.

The previous prime is 40166851. The next prime is 40166873. The reversal of 40166861 is 16866104.

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 a de Polignac number, because none of the positive numbers 2^k-40166861 is a prime.

It is a super-2 number, since 2×40166861² = 3226753445186642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40166821) 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, 2869055 + ... + 2869068.

It is an arithmetic number, because the mean of its divisors is an integer number (11476248).

Almost surely, 2^40166861 is an apocalyptic number.

It is an amenable number.

40166861 is a deficient number, since it is larger than the sum of its proper divisors (5738131).

40166861 is an equidigital number, since it uses as much as digits as its factorization.

40166861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5738130.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 40166861 is about 6337.7331120835. The cubic root of 40166861 is about 342.4700767720.

The spelling of 40166861 in words is "forty million, one hundred sixty-six thousand, eight hundred sixty-one".