401872717 has 4 divisors (see below), whose sum is σ = 401912896. Its totient is φ = 401832540.

The previous prime is 401872703. The next prime is 401872729. The reversal of 401872717 is 717278104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 401872717 - 2¹¹ = 401870669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401872417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8092 + ... + 29482.

It is an arithmetic number, because the mean of its divisors is an integer number (100478224).

Almost surely, 2^401872717 is an apocalyptic number.

It is an amenable number.

401872717 is a deficient number, since it is larger than the sum of its proper divisors (40179).

401872717 is a wasteful number, since it uses less digits than its factorization.

401872717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40178.

The product of its (nonzero) digits is 21952, while the sum is 37.

The square root of 401872717 is about 20046.7632549497. The cubic root of 401872717 is about 737.9543679847.

The spelling of 401872717 in words is "four hundred one million, eight hundred seventy-two thousand, seven hundred seventeen".