137657857 has 4 divisors (see below), whose sum is σ = 145755396. Its totient is φ = 129560320.

The previous prime is 137657837. The next prime is 137657873. The reversal of 137657857 is 758756731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 758756731 = 577 ⋅1315003.

It can be written as a sum of positive squares in 2 ways, for example, as 59582961 + 78074896 = 7719^2 + 8836^2 .

It is a cyclic number.

It is not a de Polignac number, because 137657857 - 2¹⁹ = 137133569 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 137657857.

It is not an unprimeable number, because it can be changed into a prime (137657837) 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, 4048744 + ... + 4048777.

It is an arithmetic number, because the mean of its divisors is an integer number (36438849).

Almost surely, 2^137657857 is an apocalyptic number.

137657857 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

137657857 is a deficient number, since it is larger than the sum of its proper divisors (8097539).

137657857 is an equidigital number, since it uses as much as digits as its factorization.

137657857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8097538.

The product of its digits is 1234800, while the sum is 49.

The square root of 137657857 is about 11732.7685138675. The cubic root of 137657857 is about 516.3375005435.

The spelling of 137657857 in words is "one hundred thirty-seven million, six hundred fifty-seven thousand, eight hundred fifty-seven".