2687138 has 4 divisors (see below), whose sum is σ = 4030710. Its totient is φ = 1343568.

The previous prime is 2687129. The next prime is 2687141. The reversal of 2687138 is 8317862.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2666689 + 20449 = 1633^2 + 143^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2687098 and 2687107.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 671783 + ... + 671786.

2^2687138 is an apocalyptic number.

2687138 is a deficient number, since it is larger than the sum of its proper divisors (1343572).

2687138 is a wasteful number, since it uses less digits than its factorization.

2687138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343571.

The product of its digits is 16128, while the sum is 35.

The square root of 2687138 is about 1639.2492183924. The cubic root of 2687138 is about 139.0262014338.

The spelling of 2687138 in words is "two million, six hundred eighty-seven thousand, one hundred thirty-eight".