4185381 has 4 divisors (see below), whose sum is σ = 5580512. Its totient is φ = 2790252.

The previous prime is 4185373. The next prime is 4185409. The reversal of 4185381 is 1835814.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 4185381 - 2³ = 4185373 is a prime.

It is a super-2 number, since 2×4185381² = 35034828230322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4185361) 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, 697561 + ... + 697566.

It is an arithmetic number, because the mean of its divisors is an integer number (1395128).

Almost surely, 2^4185381 is an apocalyptic number.

It is an amenable number.

4185381 is a deficient number, since it is larger than the sum of its proper divisors (1395131).

4185381 is a wasteful number, since it uses less digits than its factorization.

4185381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395130.

The product of its digits is 3840, while the sum is 30.

The square root of 4185381 is about 2045.8203733466. The cubic root of 4185381 is about 161.1554508515.

The spelling of 4185381 in words is "four million, one hundred eighty-five thousand, three hundred eighty-one".