401425521 has 32 divisors (see below), whose sum is σ = 647285760. Its totient is φ = 216167616.

The previous prime is 401425513. The next prime is 401425553. The reversal of 401425521 is 125524104.

It is not a de Polignac number, because 401425521 - 2³ = 401425513 is a prime.

It is a super-2 number, since 2×401425521² = 322284897820242882, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 401425491 and 401425500.

It is not an unprimeable number, because it can be changed into a prime (401425501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76050 + ... + 81156.

It is an arithmetic number, because the mean of its divisors is an integer number (20227680).

Almost surely, 2^401425521 is an apocalyptic number.

It is an amenable number.

401425521 is a deficient number, since it is larger than the sum of its proper divisors (245860239).

401425521 is a wasteful number, since it uses less digits than its factorization.

401425521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5333.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 401425521 is about 20035.6063297321. The cubic root of 401425521 is about 737.6805393876.

Adding to 401425521 its reverse (125524104), we get a palindrome (526949625).

The spelling of 401425521 in words is "four hundred one million, four hundred twenty-five thousand, five hundred twenty-one".