400206425 has 12 divisors (see below), whose sum is σ = 496554156. Its totient is φ = 319972800.

The previous prime is 400206419. The next prime is 400206439. The reversal of 400206425 is 524602004.

It can be written as a sum of positive squares in 6 ways, for example, as 69839449 + 330366976 = 8357^2 + 18176^2 .

It is not a de Polignac number, because 400206425 - 2⁶ = 400206361 is a prime.

It is a super-2 number, since 2×400206425² = 320330365222561250, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400206425.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 49787 + ... + 57263.

It is an arithmetic number, because the mean of its divisors is an integer number (41379513).

Almost surely, 2^400206425 is an apocalyptic number.

It is an amenable number.

400206425 is a deficient number, since it is larger than the sum of its proper divisors (96347731).

400206425 is a wasteful number, since it uses less digits than its factorization.

400206425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9628 (or 9623 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 400206425 is about 20005.1599593705. The cubic root of 400206425 is about 736.9330239651.

Adding to 400206425 its reverse (524602004), we get a palindrome (924808429).

The spelling of 400206425 in words is "four hundred million, two hundred six thousand, four hundred twenty-five".