4000961 has 4 divisors (see below), whose sum is σ = 4005972. Its totient is φ = 3995952.

The previous prime is 4000957. The next prime is 4000979. The reversal of 4000961 is 1690004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3400336 + 600625 = 1844^2 + 775^2 .

It is a cyclic number.

It is not a de Polignac number, because 4000961 - 2² = 4000957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000901) 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, 1010 + ... + 3003.

It is an arithmetic number, because the mean of its divisors is an integer number (1001493).

Almost surely, 2^4000961 is an apocalyptic number.

It is an amenable number.

4000961 is a deficient number, since it is larger than the sum of its proper divisors (5011).

4000961 is an equidigital number, since it uses as much as digits as its factorization.

4000961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5010.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 4000961 is about 2000.2402355717. The cubic root of 4000961 is about 158.7528166157.

Adding to 4000961 its reverse (1690004), we get a palindrome (5690965).

The spelling of 4000961 in words is "four million, nine hundred sixty-one", and thus it is an aban number.