406881961 has 8 divisors (see below), whose sum is σ = 439983360. Its totient is φ = 374799168.

The previous prime is 406881931. The next prime is 406882001. The reversal of 406881961 is 169188604.

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 406881961 - 2¹⁹ = 406357673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406881911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253821 + ... + 255418.

It is an arithmetic number, because the mean of its divisors is an integer number (54997920).

Almost surely, 2^406881961 is an apocalyptic number.

It is an amenable number.

406881961 is a deficient number, since it is larger than the sum of its proper divisors (33101399).

406881961 is a wasteful number, since it uses less digits than its factorization.

406881961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509303.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 406881961 is about 20171.3153016852. The cubic root of 406881961 is about 741.0078554669.

The spelling of 406881961 in words is "four hundred six million, eight hundred eighty-one thousand, nine hundred sixty-one".