401390525 has 6 divisors (see below), whose sum is σ = 497724282. Its totient is φ = 321112400.

The previous prime is 401390489. The next prime is 401390543. The reversal of 401390525 is 525093104.

It can be written as a sum of positive squares in 3 ways, for example, as 61246276 + 340144249 = 7826^2 + 18443^2 .

It is not a de Polignac number, because 401390525 - 2¹⁰ = 401389501 is a prime.

It is a super-2 number, since 2×401390525² = 322228707119551250, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8027786 + ... + 8027835.

It is an arithmetic number, because the mean of its divisors is an integer number (82954047).

Almost surely, 2^401390525 is an apocalyptic number.

It is an amenable number.

401390525 is a deficient number, since it is larger than the sum of its proper divisors (96333757).

401390525 is a wasteful number, since it uses less digits than its factorization.

401390525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16055631 (or 16055626 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 401390525 is about 20034.7329655276. The cubic root of 401390525 is about 737.6591019378.

The spelling of 401390525 in words is "four hundred one million, three hundred ninety thousand, five hundred twenty-five".