40188961 has 8 divisors (see below), whose sum is σ = 41228000. Its totient is φ = 39154752.

The previous prime is 40188949. The next prime is 40188977. The reversal of 40188961 is 16988104.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40188961 - 2¹⁷ = 40057889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40188961.

It is not an unprimeable number, because it can be changed into a prime (40188661) 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 7 ways as a sum of consecutive naturals, for example, 20521 + ... + 22393.

It is an arithmetic number, because the mean of its divisors is an integer number (5153500).

Almost surely, 2^40188961 is an apocalyptic number.

It is an amenable number.

40188961 is a deficient number, since it is larger than the sum of its proper divisors (1039039).

40188961 is a wasteful number, since it uses less digits than its factorization.

40188961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2415.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 40188961 is about 6339.4763979370. The cubic root of 40188961 is about 342.5328748170.

The spelling of 40188961 in words is "forty million, one hundred eighty-eight thousand, nine hundred sixty-one".