137387857 has 2 divisors, whose sum is σ = 137387858. Its totient is φ = 137387856.

The previous prime is 137387849. The next prime is 137387867. The reversal of 137387857 is 758783731.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137264656 + 123201 = 11716^2 + 351^2 .

It is a cyclic number.

It is not a de Polignac number, because 137387857 - 2³ = 137387849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 137387857.

It is not a weakly prime, because it can be changed into another prime (137387827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68693928 + 68693929.

It is an arithmetic number, because the mean of its divisors is an integer number (68693929).

Almost surely, 2^137387857 is an apocalyptic number.

It is an amenable number.

137387857 is a deficient number, since it is larger than the sum of its proper divisors (1).

137387857 is an equidigital number, since it uses as much as digits as its factorization.

137387857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 987840, while the sum is 49.

The square root of 137387857 is about 11721.2566305836. The cubic root of 137387857 is about 515.9997007890. Note that the first 3 decimals are identical.

The spelling of 137387857 in words is "one hundred thirty-seven million, three hundred eighty-seven thousand, eight hundred fifty-seven".