401916971 has 4 divisors (see below), whose sum is σ = 404808600. Its totient is φ = 399025344.

The previous prime is 401916961. The next prime is 401916989. The reversal of 401916971 is 179619104.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 401916971 - 2²⁶ = 334808107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401916901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1445606 + ... + 1445883.

It is an arithmetic number, because the mean of its divisors is an integer number (101202150).

Almost surely, 2^401916971 is an apocalyptic number.

401916971 is a deficient number, since it is larger than the sum of its proper divisors (2891629).

401916971 is a wasteful number, since it uses less digits than its factorization.

401916971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2891628.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 401916971 is about 20047.8669937727. The cubic root of 401916971 is about 737.9814546986.

The spelling of 401916971 in words is "four hundred one million, nine hundred sixteen thousand, nine hundred seventy-one".