40020402089 has 2 divisors, whose sum is σ = 40020402090. Its totient is φ = 40020402088.

The previous prime is 40020402067. The next prime is 40020402127. The reversal of 40020402089 is 98020402004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27728910400 + 12291491689 = 166520^2 + 110867^2 .

It is a cyclic number.

It is not a de Polignac number, because 40020402089 - 2¹² = 40020397993 is a prime.

It is not a weakly prime, because it can be changed into another prime (40020402889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20010201044 + 20010201045.

It is an arithmetic number, because the mean of its divisors is an integer number (20010201045).

Almost surely, 2^40020402089 is an apocalyptic number.

It is an amenable number.

40020402089 is a deficient number, since it is larger than the sum of its proper divisors (1).

40020402089 is an equidigital number, since it uses as much as digits as its factorization.

40020402089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 29.

The spelling of 40020402089 in words is "forty billion, twenty million, four hundred two thousand, eighty-nine".