213779906 has 32 divisors (see below), whose sum is σ = 350784000. Its totient is φ = 97338240.

The previous prime is 213779903. The next prime is 213779941. The reversal of 213779906 is 609977312.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (213779903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203270 + ... + 204318.

It is an arithmetic number, because the mean of its divisors is an integer number (10962000).

Almost surely, 2^213779906 is an apocalyptic number.

213779906 is a deficient number, since it is larger than the sum of its proper divisors (137004094).

213779906 is a wasteful number, since it uses less digits than its factorization.

213779906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1274.

The product of its (nonzero) digits is 142884, while the sum is 44.

The square root of 213779906 is about 14621.2142450619. The cubic root of 213779906 is about 597.9372741372.

The spelling of 213779906 in words is "two hundred thirteen million, seven hundred seventy-nine thousand, nine hundred six".