401358721 has 8 divisors (see below), whose sum is σ = 412644584. Its totient is φ = 390096000.

The previous prime is 401358691. The next prime is 401358733. The reversal of 401358721 is 127853104.

It can be written as a sum of positive squares in 4 ways, for example, as 211993600 + 189365121 = 14560^2 + 13761^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401358721 is a prime.

It is a super-2 number, since 2×401358721² = 322177645845511682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401358751) 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 7 ways as a sum of consecutive naturals, for example, 32971 + ... + 43471.

It is an arithmetic number, because the mean of its divisors is an integer number (51580573).

Almost surely, 2^401358721 is an apocalyptic number.

It is an amenable number.

401358721 is a deficient number, since it is larger than the sum of its proper divisors (11285863).

401358721 is a wasteful number, since it uses less digits than its factorization.

401358721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11571.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 401358721 is about 20033.9392282197. The cubic root of 401358721 is about 737.6396187261.

The spelling of 401358721 in words is "four hundred one million, three hundred fifty-eight thousand, seven hundred twenty-one".