401961905 has 8 divisors (see below), whose sum is σ = 486623592. Its totient is φ = 318723328.

The previous prime is 401961899. The next prime is 401961943. The reversal of 401961905 is 509169104.

It can be written as a sum of positive squares in 4 ways, for example, as 6071296 + 395890609 = 2464^2 + 19897^2 .

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 401961905 - 2⁸ = 401961649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355154 + ... + 356283.

It is an arithmetic number, because the mean of its divisors is an integer number (60827949).

Almost surely, 2^401961905 is an apocalyptic number.

It is an amenable number.

401961905 is a deficient number, since it is larger than the sum of its proper divisors (84661687).

401961905 is a wasteful number, since it uses less digits than its factorization.

401961905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711555.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 401961905 is about 20048.9876303019. The cubic root of 401961905 is about 738.0089555884.

The spelling of 401961905 in words is "four hundred one million, nine hundred sixty-one thousand, nine hundred five".