401668249 has 4 divisors (see below), whose sum is σ = 402106240. Its totient is φ = 401230260.

The previous prime is 401668243. The next prime is 401668259. The reversal of 401668249 is 942866104.

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.

It is a cyclic number.

It is not a de Polignac number, because 401668249 - 2⁷ = 401668121 is a prime.

It is a super-2 number, since 2×401668249² = 322674764509452002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401668243) 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, 217617 + ... + 219454.

It is an arithmetic number, because the mean of its divisors is an integer number (100526560).

Almost surely, 2^401668249 is an apocalyptic number.

It is an amenable number.

401668249 is a deficient number, since it is larger than the sum of its proper divisors (437991).

401668249 is an equidigital number, since it uses as much as digits as its factorization.

401668249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437990.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 401668249 is about 20041.6628302145. The cubic root of 401668249 is about 737.8291926538.

The spelling of 401668249 in words is "four hundred one million, six hundred sixty-eight thousand, two hundred forty-nine".