3929869 has 6 divisors (see below), whose sum is σ = 3977390. Its totient is φ = 3882840.

The previous prime is 3929857. The next prime is 3929879. The reversal of 3929869 is 9689293.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 3861225 + 68644 = 1965^2 + 262^2 .

It is not a de Polignac number, because 3929869 - 2⁷ = 3929741 is a prime.

It is a super-2 number, since 2×3929869² = 30887740714322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3929879) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17047 + ... + 17275.

Almost surely, 2^3929869 is an apocalyptic number.

It is an amenable number.

3929869 is a deficient number, since it is larger than the sum of its proper divisors (47521).

3929869 is an equidigital number, since it uses as much as digits as its factorization.

3929869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491 (or 360 counting only the distinct ones).

The product of its digits is 209952, while the sum is 46.

The square root of 3929869 is about 1982.3897195052. The cubic root of 3929869 is about 157.8069130918.

The spelling of 3929869 in words is "three million, nine hundred twenty-nine thousand, eight hundred sixty-nine".