3949139923 has 2 divisors, whose sum is σ = 3949139924. Its totient is φ = 3949139922.

The previous prime is 3949139921. The next prime is 3949139947. The reversal of 3949139923 is 3299319493.

It is a weak prime.

It is an emirp because it is prime and its reverse (3299319493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3949139923 - 2¹ = 3949139921 is a prime.

It is a super-2 number, since 2×3949139923² = 31191412262864891858, which contains 22 as substring.

Together with 3949139921, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3949139921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1974569961 + 1974569962.

It is an arithmetic number, because the mean of its divisors is an integer number (1974569962).

Almost surely, 2^3949139923 is an apocalyptic number.

3949139923 is a deficient number, since it is larger than the sum of its proper divisors (1).

3949139923 is an equidigital number, since it uses as much as digits as its factorization.

3949139923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1417176, while the sum is 52.

The square root of 3949139923 is about 62842.1826721510. The cubic root of 3949139923 is about 1580.6443885210.

The spelling of 3949139923 in words is "three billion, nine hundred forty-nine million, one hundred thirty-nine thousand, nine hundred twenty-three".