137403257 has 4 divisors (see below), whose sum is σ = 137444340. Its totient is φ = 137362176.

The previous prime is 137403241. The next prime is 137403283. The reversal of 137403257 is 752304731.

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 4946176 + 132457081 = 2224^2 + 11509^2 .

It is a cyclic number.

It is not a de Polignac number, because 137403257 - 2⁴ = 137403241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137403157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15032 + ... + 22377.

It is an arithmetic number, because the mean of its divisors is an integer number (34361085).

Almost surely, 2^137403257 is an apocalyptic number.

It is an amenable number.

137403257 is a deficient number, since it is larger than the sum of its proper divisors (41083).

137403257 is an equidigital number, since it uses as much as digits as its factorization.

137403257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41082.

The product of its (nonzero) digits is 17640, while the sum is 32.

The square root of 137403257 is about 11721.9135383264. The cubic root of 137403257 is about 516.0189797818.

Adding to 137403257 its reverse (752304731), we get a palindrome (889707988).

The spelling of 137403257 in words is "one hundred thirty-seven million, four hundred three thousand, two hundred fifty-seven".