137818 has 4 divisors (see below), whose sum is σ = 206730. Its totient is φ = 68908.

The previous prime is 137803. The next prime is 137827. The reversal of 137818 is 818731.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 818731 = 23 ⋅35597.

It can be written as a sum of positive squares in only one way, i.e., 104329 + 33489 = 323^2 + 183^2 .

It is a super-2 number, since 2×137818² = 37987602248, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34453 + ... + 34456.

2¹³⁷⁸¹⁸ is an apocalyptic number.

137818 is a deficient number, since it is larger than the sum of its proper divisors (68912).

137818 is an equidigital number, since it uses as much as digits as its factorization.

137818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68911.

The product of its digits is 1344, while the sum is 28.

The square root of 137818 is about 371.2384678344. The cubic root of 137818 is about 51.6537648442.

The spelling of 137818 in words is "one hundred thirty-seven thousand, eight hundred eighteen".