213806428 has 12 divisors (see below), whose sum is σ = 408175992. Its totient is φ = 97184720.

The previous prime is 213806401. The next prime is 213806429. The reversal of 213806428 is 824608312.

It is a junction number, because it is equal to n+sod(n) for n = 213806393 and 213806402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213806429) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2429575 + ... + 2429662.

It is an arithmetic number, because the mean of its divisors is an integer number (34014666).

Almost surely, 2^213806428 is an apocalyptic number.

It is an amenable number.

213806428 is a deficient number, since it is larger than the sum of its proper divisors (194369564).

213806428 is a wasteful number, since it uses less digits than its factorization.

213806428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4859252 (or 4859250 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 213806428 is about 14622.1211867499. The cubic root of 213806428 is about 597.9620002475.

The spelling of 213806428 in words is "two hundred thirteen million, eight hundred six thousand, four hundred twenty-eight".