401686225 has 12 divisors (see below), whose sum is σ = 510240780. Its totient is φ = 313510400.

The previous prime is 401686169. The next prime is 401686247. The reversal of 401686225 is 522686104.

It can be written as a sum of positive squares in 6 ways, for example, as 108180801 + 293505424 = 10401^2 + 17132^2 .

It is not a de Polignac number, because 401686225 - 2¹⁵ = 401653457 is a prime.

It is a super-2 number, since 2×401686225² = 322703646709501250, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 194920 + ... + 196969.

It is an arithmetic number, because the mean of its divisors is an integer number (42520065).

Almost surely, 2^401686225 is an apocalyptic number.

It is an amenable number.

401686225 is a deficient number, since it is larger than the sum of its proper divisors (108554555).

401686225 is a wasteful number, since it uses less digits than its factorization.

401686225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391940 (or 391935 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 401686225 is about 20042.1112909793. Note that the first 3 decimals coincide. The cubic root of 401686225 is about 737.8401992658.

The spelling of 401686225 in words is "four hundred one million, six hundred eighty-six thousand, two hundred twenty-five".