4001381 has 4 divisors (see below), whose sum is σ = 4212000. Its totient is φ = 3790764.

The previous prime is 4001369. The next prime is 4001383. The reversal of 4001381 is 1831004.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 4001381 - 2¹⁰ = 4000357 is a prime.

It is a super-2 number, since 2×4001381² = 32022099814322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4001383) 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, 105281 + ... + 105318.

It is an arithmetic number, because the mean of its divisors is an integer number (1053000).

Almost surely, 2^4001381 is an apocalyptic number.

It is an amenable number.

4001381 is a deficient number, since it is larger than the sum of its proper divisors (210619).

4001381 is a wasteful number, since it uses less digits than its factorization.

4001381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210618.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 4001381 is about 2000.3452202058. The cubic root of 4001381 is about 158.7583714353.

Adding to 4001381 its reverse (1831004), we get a palindrome (5832385).

The spelling of 4001381 in words is "four million, one thousand, three hundred eighty-one".