137940493 has 4 divisors (see below), whose sum is σ = 138188700. Its totient is φ = 137692288.

The previous prime is 137940469. The next prime is 137940521. The reversal of 137940493 is 394049731.

It is a happy number.

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 5299204 + 132641289 = 2302^2 + 11517^2 .

It is a cyclic number.

It is not a de Polignac number, because 137940493 - 2²¹ = 135843341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137940293) 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, 123268 + ... + 124381.

It is an arithmetic number, because the mean of its divisors is an integer number (34547175).

Almost surely, 2^137940493 is an apocalyptic number.

It is an amenable number.

137940493 is a deficient number, since it is larger than the sum of its proper divisors (248207).

137940493 is an equidigital number, since it uses as much as digits as its factorization.

137940493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248206.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 137940493 is about 11744.8070652523. The cubic root of 137940493 is about 516.6906364645.

The spelling of 137940493 in words is "one hundred thirty-seven million, nine hundred forty thousand, four hundred ninety-three".