3939769949 has 2 divisors, whose sum is σ = 3939769950. Its totient is φ = 3939769948.

The previous prime is 3939769937. The next prime is 3939769957. The reversal of 3939769949 is 9499679393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2114344324 + 1825425625 = 45982^2 + 42725^2 .

It is an emirp because it is prime and its reverse (9499679393) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3939769949 - 2¹² = 3939765853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3939769919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1969884974 + 1969884975.

It is an arithmetic number, because the mean of its divisors is an integer number (1969884975).

Almost surely, 2^3939769949 is an apocalyptic number.

It is an amenable number.

3939769949 is a deficient number, since it is larger than the sum of its proper divisors (1).

3939769949 is an equidigital number, since it uses as much as digits as its factorization.

3939769949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 89282088, while the sum is 68.

The square root of 3939769949 is about 62767.5867705618. The cubic root of 3939769949 is about 1579.3932869233.

The spelling of 3939769949 in words is "three billion, nine hundred thirty-nine million, seven hundred sixty-nine thousand, nine hundred forty-nine".