39720893 has 2 divisors, whose sum is σ = 39720894. Its totient is φ = 39720892.

The previous prime is 39720881. The next prime is 39720907. The reversal of 39720893 is 39802793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34421689 + 5299204 = 5867^2 + 2302^2 .

It is a cyclic number.

It is not a de Polignac number, because 39720893 - 2⁶ = 39720829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39720893.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39720293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19860446 + 19860447.

It is an arithmetic number, because the mean of its divisors is an integer number (19860447).

Almost surely, 2^39720893 is an apocalyptic number.

It is an amenable number.

39720893 is a deficient number, since it is larger than the sum of its proper divisors (1).

39720893 is an equidigital number, since it uses as much as digits as its factorization.

39720893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 39720893 is about 6302.4513484834. The cubic root of 39720893 is about 341.1978882529.

The spelling of 39720893 in words is "thirty-nine million, seven hundred twenty thousand, eight hundred ninety-three".