403961 has 8 divisors (see below), whose sum is σ = 424704. Its totient is φ = 383760.

The previous prime is 403957. The next prime is 403969. The reversal of 403961 is 169304.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 403961 - 2² = 403957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (403969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2495 + ... + 2651.

It is an arithmetic number, because the mean of its divisors is an integer number (53088).

2⁴⁰³⁹⁶¹ is an apocalyptic number.

It is an amenable number.

403961 is a deficient number, since it is larger than the sum of its proper divisors (20743).

403961 is a wasteful number, since it uses less digits than its factorization.

403961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 403961 is about 635.5792633496. The cubic root of 403961 is about 73.9230390524.

The spelling of 403961 in words is "four hundred three thousand, nine hundred sixty-one".