40690189 has 2 divisors, whose sum is σ = 40690190. Its totient is φ = 40690188.

The previous prime is 40690187. The next prime is 40690193. The reversal of 40690189 is 98109604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40220964 + 469225 = 6342^2 + 685^2 .

It is a cyclic number.

It is not a de Polignac number, because 40690189 - 2¹ = 40690187 is a prime.

Together with 40690187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40690187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20345094 + 20345095.

It is an arithmetic number, because the mean of its divisors is an integer number (20345095).

Almost surely, 2^40690189 is an apocalyptic number.

It is an amenable number.

40690189 is a deficient number, since it is larger than the sum of its proper divisors (1).

40690189 is an equidigital number, since it uses as much as digits as its factorization.

40690189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 40690189 is about 6378.8861880425. The cubic root of 40690189 is about 343.9509941232.

The spelling of 40690189 in words is "forty million, six hundred ninety thousand, one hundred eighty-nine".