401668424 has 8 divisors (see below), whose sum is σ = 753128310. Its totient is φ = 200834208.

The previous prime is 401668391. The next prime is 401668427. The reversal of 401668424 is 424866104.

It can be written as a sum of positive squares in only one way, i.e., 319765924 + 81902500 = 17882^2 + 9050^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×401668424² = 322675045677287552, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401668427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25104269 + ... + 25104284.

Almost surely, 2^401668424 is an apocalyptic number.

It is an amenable number.

401668424 is a deficient number, since it is larger than the sum of its proper divisors (351459886).

401668424 is a wasteful number, since it uses less digits than its factorization.

401668424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50208559 (or 50208555 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 35.

The square root of 401668424 is about 20041.6671961192. The cubic root of 401668424 is about 737.8292998070.

The spelling of 401668424 in words is "four hundred one million, six hundred sixty-eight thousand, four hundred twenty-four".