401961 has 8 divisors (see below), whose sum is σ = 612544. Its totient is φ = 229680.

The previous prime is 401959. The next prime is 401981. The reversal of 401961 is 169104.

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

It is not a de Polignac number, because 401961 - 2¹ = 401959 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 19141 = 401961 / (4 + 0 + 1 + 9 + 6 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9550 + ... + 9591.

It is an arithmetic number, because the mean of its divisors is an integer number (76568).

2⁴⁰¹⁹⁶¹ is an apocalyptic number.

It is an amenable number.

401961 is a deficient number, since it is larger than the sum of its proper divisors (210583).

401961 is a wasteful number, since it uses less digits than its factorization.

401961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19151.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 401961 is about 634.0039432054. The cubic root of 401961 is about 73.8008401723.

The spelling of 401961 in words is "four hundred one thousand, nine hundred sixty-one".