39391000057 has 4 divisors (see below), whose sum is σ = 39391721460. Its totient is φ = 39390278656.

The previous prime is 39391000031. The next prime is 39391000069. The reversal of 39391000057 is 75000019393.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15238421136 + 24152578921 = 123444^2 + 155411^2 .

It is a cyclic number.

It is not a de Polignac number, because 39391000057 - 2⁷ = 39390999929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39391000027) 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, 271432 + ... + 390457.

It is an arithmetic number, because the mean of its divisors is an integer number (9847930365).

Almost surely, 2^39391000057 is an apocalyptic number.

It is an amenable number.

39391000057 is a deficient number, since it is larger than the sum of its proper divisors (721403).

39391000057 is an equidigital number, since it uses as much as digits as its factorization.

39391000057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721402.

The product of its (nonzero) digits is 25515, while the sum is 37.

The spelling of 39391000057 in words is "thirty-nine billion, three hundred ninety-one million, fifty-seven", and thus it is an aban number.