401647457 has 4 divisors (see below), whose sum is σ = 425273796. Its totient is φ = 378021120.

The previous prime is 401647453. The next prime is 401647483. The reversal of 401647457 is 754746104.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 313962961 + 87684496 = 17719^2 + 9364^2 .

It is a cyclic number.

It is not a de Polignac number, because 401647457 - 2² = 401647453 is a prime.

It is a super-2 number, since 2×401647457² = 322641359429133698, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 401647457.

It is not an unprimeable number, because it can be changed into a prime (401647453) 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, 11813144 + ... + 11813177.

It is an arithmetic number, because the mean of its divisors is an integer number (106318449).

Almost surely, 2^401647457 is an apocalyptic number.

It is an amenable number.

401647457 is a deficient number, since it is larger than the sum of its proper divisors (23626339).

401647457 is a wasteful number, since it uses less digits than its factorization.

401647457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23626338.

The product of its (nonzero) digits is 94080, while the sum is 38.

The square root of 401647457 is about 20041.1441040675. The cubic root of 401647457 is about 737.8164614099.

The spelling of 401647457 in words is "four hundred one million, six hundred forty-seven thousand, four hundred fifty-seven".