39699749 has 2 divisors, whose sum is σ = 39699750. Its totient is φ = 39699748.

The previous prime is 39699739. The next prime is 39699761. The reversal of 39699749 is 94799693.

39699749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37576900 + 2122849 = 6130^2 + 1457^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39699749 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39699694 and 39699703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39699739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19849874 + 19849875.

It is an arithmetic number, because the mean of its divisors is an integer number (19849875).

Almost surely, 2^39699749 is an apocalyptic number.

It is an amenable number.

39699749 is a deficient number, since it is larger than the sum of its proper divisors (1).

39699749 is an equidigital number, since it uses as much as digits as its factorization.

39699749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3306744, while the sum is 56.

The square root of 39699749 is about 6300.7736826520. The cubic root of 39699749 is about 341.1373360005.

Subtracting from 39699749 its sum of digits (56), we obtain a palindrome (39699693).

The spelling of 39699749 in words is "thirty-nine million, six hundred ninety-nine thousand, seven hundred forty-nine".