213903979 has 16 divisors (see below), whose sum is σ = 237619008. Its totient is φ = 191521792.

The previous prime is 213903959. The next prime is 213904001. The reversal of 213903979 is 979309312.

It is a cyclic number.

It is not a de Polignac number, because 213903979 - 2¹¹ = 213901931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213903959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75639 + ... + 78415.

It is an arithmetic number, because the mean of its divisors is an integer number (14851188).

Almost surely, 2^213903979 is an apocalyptic number.

213903979 is a deficient number, since it is larger than the sum of its proper divisors (23715029).

213903979 is a wasteful number, since it uses less digits than its factorization.

213903979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014.

The product of its (nonzero) digits is 91854, while the sum is 43.

The square root of 213903979 is about 14625.4565398828. The cubic root of 213903979 is about 598.0529281684.

The spelling of 213903979 in words is "two hundred thirteen million, nine hundred three thousand, nine hundred seventy-nine".