8403961 has 4 divisors (see below), whose sum is σ = 8413300. Its totient is φ = 8394624.

The previous prime is 8403959. The next prime is 8403977. The reversal of 8403961 is 1693048.

8403961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1742400 + 6661561 = 1320^2 + 2581^2 .

It is a cyclic number.

It is not a de Polignac number, because 8403961 - 2¹ = 8403959 is a prime.

It is a Duffinian number.

8403961 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8403931) 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, 3156 + ... + 5173.

It is an arithmetic number, because the mean of its divisors is an integer number (2103325).

Almost surely, 2^8403961 is an apocalyptic number.

It is an amenable number.

8403961 is a deficient number, since it is larger than the sum of its proper divisors (9339).

8403961 is a wasteful number, since it uses less digits than its factorization.

8403961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9338.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 8403961 is about 2898.9586061205. The cubic root of 8403961 is about 203.3112182941.

It can be divided in two parts, 84039 and 61, that added together give a square (84100 = 290²).

The spelling of 8403961 in words is "eight million, four hundred three thousand, nine hundred sixty-one".