213403618 has 16 divisors (see below), whose sum is σ = 340209720. Its totient is φ = 100047616.

The previous prime is 213403613. The next prime is 213403627. The reversal of 213403618 is 816304312.

213403618 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 102880449 + 110523169 = 10143^2 + 10513^2 .

It is a super-2 number, since 2×213403618² = 91082208350979848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213403613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2521 + ... + 20812.

Almost surely, 2^213403618 is an apocalyptic number.

213403618 is a deficient number, since it is larger than the sum of its proper divisors (126806102).

213403618 is a wasteful number, since it uses less digits than its factorization.

213403618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23621.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 213403618 is about 14608.3406997509. The cubic root of 213403618 is about 597.5862452607.

The spelling of 213403618 in words is "two hundred thirteen million, four hundred three thousand, six hundred eighteen".