8400961 has 4 divisors (see below), whose sum is σ = 8628052. Its totient is φ = 8173872.

The previous prime is 8400943. The next prime is 8400967. The reversal of 8400961 is 1690048.

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 4177936 + 4223025 = 2044^2 + 2055^2 .

It is a cyclic number.

It is not a de Polignac number, because 8400961 - 2¹¹ = 8398913 is a prime.

It is a super-2 number, since 2×8400961² = 141152291447042, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8400967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113490 + ... + 113563.

It is an arithmetic number, because the mean of its divisors is an integer number (2157013).

Almost surely, 2^8400961 is an apocalyptic number.

It is an amenable number.

8400961 is a deficient number, since it is larger than the sum of its proper divisors (227091).

8400961 is a wasteful number, since it uses less digits than its factorization.

8400961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227090.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 8400961 is about 2898.4411327470. The cubic root of 8400961 is about 203.2870231062.

The spelling of 8400961 in words is "eight million, four hundred thousand, nine hundred sixty-one".