39813139 has 4 divisors (see below), whose sum is σ = 39826080. Its totient is φ = 39800200.

The previous prime is 39813131. The next prime is 39813157. The reversal of 39813139 is 93131893.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 93131893 = 83 ⋅1122071.

It is a cyclic number.

It is not a de Polignac number, because 39813139 - 2³ = 39813131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39813098 and 39813107.

It is not an unprimeable number, because it can be changed into a prime (39813131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1089 + ... + 8989.

It is an arithmetic number, because the mean of its divisors is an integer number (9956520).

Almost surely, 2^39813139 is an apocalyptic number.

39813139 is a deficient number, since it is larger than the sum of its proper divisors (12941).

39813139 is an equidigital number, since it uses as much as digits as its factorization.

39813139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12940.

The product of its digits is 17496, while the sum is 37.

The square root of 39813139 is about 6309.7653680624. The cubic root of 39813139 is about 341.4618115496.

The spelling of 39813139 in words is "thirty-nine million, eight hundred thirteen thousand, one hundred thirty-nine".