3781538 has 4 divisors (see below), whose sum is σ = 5672310. Its totient is φ = 1890768.

The previous prime is 3781517. The next prime is 3781543. The reversal of 3781538 is 8351873.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8351873 = 827 ⋅10099.

It can be written as a sum of positive squares in only one way, i.e., 1923769 + 1857769 = 1387^2 + 1363^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3781498 and 3781507.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945383 + ... + 945386.

Almost surely, 2^3781538 is an apocalyptic number.

3781538 is a deficient number, since it is larger than the sum of its proper divisors (1890772).

3781538 is a wasteful number, since it uses less digits than its factorization.

3781538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1890771.

The product of its digits is 20160, while the sum is 35.

The square root of 3781538 is about 1944.6177002177. The cubic root of 3781538 is about 155.7959473229.

The spelling of 3781538 in words is "three million, seven hundred eighty-one thousand, five hundred thirty-eight".