40085989 has 2 divisors, whose sum is σ = 40085990. Its totient is φ = 40085988.

The previous prime is 40085977. The next prime is 40085999. The reversal of 40085989 is 98958004.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23357889 + 16728100 = 4833^2 + 4090^2 .

It is a cyclic number.

It is not a de Polignac number, because 40085989 - 2¹¹ = 40083941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40085939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20042994 + 20042995.

It is an arithmetic number, because the mean of its divisors is an integer number (20042995).

Almost surely, 2^40085989 is an apocalyptic number.

It is an amenable number.

40085989 is a deficient number, since it is larger than the sum of its proper divisors (1).

40085989 is an equidigital number, since it uses as much as digits as its factorization.

40085989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 40085989 is about 6331.3496981291. The cubic root of 40085989 is about 342.2400791400.

The spelling of 40085989 in words is "forty million, eighty-five thousand, nine hundred eighty-nine".