400520213 has 4 divisors (see below), whose sum is σ = 400580940. Its totient is φ = 400459488.

The previous prime is 400520207. The next prime is 400520231. The reversal of 400520213 is 312025004.

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 206698129 + 193822084 = 14377^2 + 13922^2 .

It is a cyclic number.

It is not a de Polignac number, because 400520213 - 2²⁶ = 333411349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400520191 and 400520200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400520273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19070 + ... + 34127.

It is an arithmetic number, because the mean of its divisors is an integer number (100145235).

Almost surely, 2^400520213 is an apocalyptic number.

It is an amenable number.

400520213 is a deficient number, since it is larger than the sum of its proper divisors (60727).

400520213 is an equidigital number, since it uses as much as digits as its factorization.

400520213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60726.

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

The square root of 400520213 is about 20013.0010992854. The cubic root of 400520213 is about 737.1255748718.

Adding to 400520213 its reverse (312025004), we get a palindrome (712545217).

The spelling of 400520213 in words is "four hundred million, five hundred twenty thousand, two hundred thirteen".