40778189 has 6 divisors (see below), whose sum is σ = 43318314. Its totient is φ = 38379200.

The previous prime is 40778173. The next prime is 40778191. The reversal of 40778189 is 98187704.

It can be written as a sum of positive squares in 3 ways, for example, as 28408900 + 12369289 = 5330^2 + 3517^2 .

It is not a de Polignac number, because 40778189 - 2⁴ = 40778173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40778119) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70262 + ... + 70839.

It is an arithmetic number, because the mean of its divisors is an integer number (7219719).

Almost surely, 2^40778189 is an apocalyptic number.

It is an amenable number.

40778189 is a deficient number, since it is larger than the sum of its proper divisors (2540125).

40778189 is a wasteful number, since it uses less digits than its factorization.

40778189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141135 (or 141118 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 40778189 is about 6385.7802185794. The cubic root of 40778189 is about 344.1987679691.

The spelling of 40778189 in words is "forty million, seven hundred seventy-eight thousand, one hundred eighty-nine".