213642406 has 8 divisors (see below), whose sum is σ = 323458920. Its totient is φ = 105822768.

The previous prime is 213642389. The next prime is 213642427. The reversal of 213642406 is 604246312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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, 498951 + ... + 499378.

It is an arithmetic number, because the mean of its divisors is an integer number (40432365).

Almost surely, 2^213642406 is an apocalyptic number.

213642406 is a deficient number, since it is larger than the sum of its proper divisors (109816514).

213642406 is a wasteful number, since it uses less digits than its factorization.

213642406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998438.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 213642406 is about 14616.5114168874. The cubic root of 213642406 is about 597.8090519081.

Adding to 213642406 its reverse (604246312), we get a palindrome (817888718).

The spelling of 213642406 in words is "two hundred thirteen million, six hundred forty-two thousand, four hundred six".