39864389 has 2 divisors, whose sum is σ = 39864390. Its totient is φ = 39864388.

The previous prime is 39864379. The next prime is 39864443. The reversal of 39864389 is 98346893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30713764 + 9150625 = 5542^2 + 3025^2 .

It is a cyclic number.

It is not a de Polignac number, because 39864389 - 2⁴ = 39864373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39864379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19932194 + 19932195.

It is an arithmetic number, because the mean of its divisors is an integer number (19932195).

Almost surely, 2^39864389 is an apocalyptic number.

It is an amenable number.

39864389 is a deficient number, since it is larger than the sum of its proper divisors (1).

39864389 is an equidigital number, since it uses as much as digits as its factorization.

39864389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 50.

The square root of 39864389 is about 6313.8252272295. The cubic root of 39864389 is about 341.6082658328.

The spelling of 39864389 in words is "thirty-nine million, eight hundred sixty-four thousand, three hundred eighty-nine".