3949685129 has 4 divisors (see below), whose sum is σ = 4253507076. Its totient is φ = 3645863184.

The previous prime is 3949685119. The next prime is 3949685137. The reversal of 3949685129 is 9215869493.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1595203600 + 2354481529 = 39940^2 + 48523^2 .

It is a cyclic number.

It is not a de Polignac number, because 3949685129 - 2⁸ = 3949684873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3949685119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151910954 + ... + 151910979.

It is an arithmetic number, because the mean of its divisors is an integer number (1063376769).

Almost surely, 2^3949685129 is an apocalyptic number.

It is an amenable number.

3949685129 is a deficient number, since it is larger than the sum of its proper divisors (303821947).

3949685129 is a wasteful number, since it uses less digits than its factorization.

3949685129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303821946.

The product of its digits is 4199040, while the sum is 56.

The square root of 3949685129 is about 62846.5204207838. The cubic root of 3949685129 is about 1580.7171247932.

The spelling of 3949685129 in words is "three billion, nine hundred forty-nine million, six hundred eighty-five thousand, one hundred twenty-nine".