39743989 has 2 divisors, whose sum is σ = 39743990. Its totient is φ = 39743988.

The previous prime is 39743983. The next prime is 39744013. The reversal of 39743989 is 98934793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39627025 + 116964 = 6295^2 + 342^2 .

It is a cyclic number.

It is not a de Polignac number, because 39743989 - 2⁷ = 39743861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39743983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19871994 + 19871995.

It is an arithmetic number, because the mean of its divisors is an integer number (19871995).

Almost surely, 2^39743989 is an apocalyptic number.

It is an amenable number.

39743989 is a deficient number, since it is larger than the sum of its proper divisors (1).

39743989 is an equidigital number, since it uses as much as digits as its factorization.

39743989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 52.

The square root of 39743989 is about 6304.2833851279. The cubic root of 39743989 is about 341.2640060982.

The spelling of 39743989 in words is "thirty-nine million, seven hundred forty-three thousand, nine hundred eighty-nine".