400212530 has 16 divisors (see below), whose sum is σ = 728478360. Its totient is φ = 158285952.

The previous prime is 400212503. The next prime is 400212563. The reversal of 400212530 is 35212004.

It can be written as a sum of positive squares in 4 ways, for example, as 364008241 + 36204289 = 19079^2 + 6017^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 400212499 and 400212508.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223949 + ... + 225728.

Almost surely, 2^400212530 is an apocalyptic number.

400212530 is a deficient number, since it is larger than the sum of its proper divisors (328265830).

400212530 is a wasteful number, since it uses less digits than its factorization.

400212530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449773.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 400212530 is about 20005.3125444218. The cubic root of 400212530 is about 736.9367711590.

Adding to 400212530 its reverse (35212004), we get a palindrome (435424534).

The spelling of 400212530 in words is "four hundred million, two hundred twelve thousand, five hundred thirty".