3138809957 has 4 divisors (see below), whose sum is σ = 3142749036. Its totient is φ = 3134870880.

The previous prime is 3138809939. The next prime is 3138809959. The reversal of 3138809957 is 7599088313.

It is a happy number.

3138809957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7599088313 = 59 ⋅128798107.

It can be written as a sum of positive squares in 2 ways, for example, as 2610085921 + 528724036 = 51089^2 + 22994^2 .

It is a cyclic number.

It is not a de Polignac number, because 3138809957 - 2⁶ = 3138809893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3138809899 and 3138809908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3138809959) 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, 1968344 + ... + 1969937.

It is an arithmetic number, because the mean of its divisors is an integer number (785687259).

Almost surely, 2^3138809957 is an apocalyptic number.

It is an amenable number.

3138809957 is a deficient number, since it is larger than the sum of its proper divisors (3939079).

3138809957 is an equidigital number, since it uses as much as digits as its factorization.

3138809957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3939078.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The square root of 3138809957 is about 56025.0832841862. The cubic root of 3138809957 is about 1464.1593342675.

The spelling of 3138809957 in words is "three billion, one hundred thirty-eight million, eight hundred nine thousand, nine hundred fifty-seven".