4023781 has 16 divisors (see below), whose sum is σ = 4572288. Its totient is φ = 3520000.

The previous prime is 4023751. The next prime is 4023791. The reversal of 4023781 is 1873204.

It is a cyclic number.

It is not a de Polignac number, because 4023781 - 2⁵ = 4023749 is a prime.

It is a super-2 number, since 2×4023781² = 32381627071922, 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 (4023731) 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, 15906 + ... + 16156.

It is an arithmetic number, because the mean of its divisors is an integer number (285768).

Almost surely, 2^4023781 is an apocalyptic number.

4023781 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4023781 is a deficient number, since it is larger than the sum of its proper divisors (548507).

4023781 is a wasteful number, since it uses less digits than its factorization.

4023781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 4023781 is about 2005.9364396710. The cubic root of 4023781 is about 159.0540670260.

Adding to 4023781 its reverse (1873204), we get a palindrome (5896985).

The spelling of 4023781 in words is "four million, twenty-three thousand, seven hundred eighty-one".