39945889 has 2 divisors, whose sum is σ = 39945890. Its totient is φ = 39945888.

The previous prime is 39945883. The next prime is 39945901. The reversal of 39945889 is 98854993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29757025 + 10188864 = 5455^2 + 3192^2 .

It is a cyclic number.

It is not a de Polignac number, because 39945889 - 2³ = 39945881 is a prime.

It is not a weakly prime, because it can be changed into another prime (39945881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19972944 + 19972945.

It is an arithmetic number, because the mean of its divisors is an integer number (19972945).

Almost surely, 2^39945889 is an apocalyptic number.

It is an amenable number.

39945889 is a deficient number, since it is larger than the sum of its proper divisors (1).

39945889 is an equidigital number, since it uses as much as digits as its factorization.

39945889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2799360, while the sum is 55.

The square root of 39945889 is about 6320.2760224534. The cubic root of 39945889 is about 341.8409055633.

The spelling of 39945889 in words is "thirty-nine million, nine hundred forty-five thousand, eight hundred eighty-nine".