3657381 has 16 divisors (see below), whose sum is σ = 6002304. Its totient is φ = 1929024.

The previous prime is 3657361. The next prime is 3657383. The reversal of 3657381 is 1837563.

It is a happy number.

3657381 is nontrivially palindromic in base 9.

It is not a de Polignac number, because 3657381 - 2⁶ = 3657317 is a prime.

It is a super-2 number, since 2×3657381² = 26752871558322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3657383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6426 + ... + 6971.

It is an arithmetic number, because the mean of its divisors is an integer number (375144).

Almost surely, 2^3657381 is an apocalyptic number.

It is an amenable number.

3657381 is a deficient number, since it is larger than the sum of its proper divisors (2344923).

3657381 is a wasteful number, since it uses less digits than its factorization.

3657381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13420.

The product of its digits is 15120, while the sum is 33.

The square root of 3657381 is about 1912.4280378618. The cubic root of 3657381 is about 154.0718869418.

The spelling of 3657381 in words is "three million, six hundred fifty-seven thousand, three hundred eighty-one".