400528213 has 4 divisors (see below), whose sum is σ = 405028620. Its totient is φ = 396027808.

The previous prime is 400528201. The next prime is 400528217. The reversal of 400528213 is 312825004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 170641969 + 229886244 = 13063^2 + 15162^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400528213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400528217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2250070 + ... + 2250247.

It is an arithmetic number, because the mean of its divisors is an integer number (101257155).

Almost surely, 2^400528213 is an apocalyptic number.

It is an amenable number.

400528213 is a deficient number, since it is larger than the sum of its proper divisors (4500407).

400528213 is an equidigital number, since it uses as much as digits as its factorization.

400528213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4500406.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 400528213 is about 20013.2009683609. The cubic root of 400528213 is about 737.1304826269.

The spelling of 400528213 in words is "four hundred million, five hundred twenty-eight thousand, two hundred thirteen".