3935780829 has 18 divisors (see below), whose sum is σ = 5740038590. Its totient is φ = 2598483888.

The previous prime is 3935780819. The next prime is 3935780867. The reversal of 3935780829 is 9280875393.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 3610808100 + 324972729 = 60090^2 + 18027^2 .

It is not a de Polignac number, because 3935780829 - 2¹³ = 3935772637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3935780809) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1963942 + ... + 1965944.

Almost surely, 2^3935780829 is an apocalyptic number.

It is an amenable number.

3935780829 is a deficient number, since it is larger than the sum of its proper divisors (1804257761).

3935780829 is an equidigital number, since it uses as much as digits as its factorization.

3935780829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4121 (or 2115 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The square root of 3935780829 is about 62735.8018120435. The cubic root of 3935780829 is about 1578.8600479217.

The spelling of 3935780829 in words is "three billion, nine hundred thirty-five million, seven hundred eighty thousand, eight hundred twenty-nine".