4001641 has 16 divisors (see below), whose sum is σ = 4773888. Its totient is φ = 3283200.

The previous prime is 4001639. The next prime is 4001689. The reversal of 4001641 is 1461004.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 4001641 - 2¹ = 4001639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4001611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20856 + ... + 21046.

It is an arithmetic number, because the mean of its divisors is an integer number (298368).

Almost surely, 2^4001641 is an apocalyptic number.

4001641 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4001641 is a deficient number, since it is larger than the sum of its proper divisors (772247).

4001641 is a wasteful number, since it uses less digits than its factorization.

4001641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 4001641 is about 2000.4102079324. The cubic root of 4001641 is about 158.7618099384.

Adding to 4001641 its reverse (1461004), we get a palindrome (5462645).

The spelling of 4001641 in words is "four million, one thousand, six hundred forty-one".