3969181439 has 4 divisors (see below), whose sum is σ = 3969448320. Its totient is φ = 3968914560.

The previous prime is 3969181427. The next prime is 3969181457. The reversal of 3969181439 is 9341819693.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9341819693 = 59 ⋅158335927.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3969181439 is a prime.

It is a super-2 number, since 2×3969181439² = 31508802591404221442, 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 (3969181459) 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, 109727 + ... + 141344.

It is an arithmetic number, because the mean of its divisors is an integer number (992362080).

Almost surely, 2^3969181439 is an apocalyptic number.

3969181439 is a deficient number, since it is larger than the sum of its proper divisors (266881).

3969181439 is a wasteful number, since it uses less digits than its factorization.

3969181439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266880.

The product of its digits is 1259712, while the sum is 53.

The square root of 3969181439 is about 63001.4399756069. The cubic root of 3969181439 is about 1583.3137521887.

The spelling of 3969181439 in words is "three billion, nine hundred sixty-nine million, one hundred eighty-one thousand, four hundred thirty-nine".