213918929 has 16 divisors (see below), whose sum is σ = 268538880. Its totient is φ = 166153680.

The previous prime is 213918923. The next prime is 213918961. The reversal of 213918929 is 929819312.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-213918929 is a prime.

It is a super-2 number, since 2×213918929² = 91522616369014082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213918929.

It is not an unprimeable number, because it can be changed into a prime (213918923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31907 + ... + 38024.

It is an arithmetic number, because the mean of its divisors is an integer number (16783680).

Almost surely, 2^213918929 is an apocalyptic number.

It is an amenable number.

213918929 is a deficient number, since it is larger than the sum of its proper divisors (54619951).

213918929 is a wasteful number, since it uses less digits than its factorization.

213918929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69980.

The product of its digits is 69984, while the sum is 44.

The square root of 213918929 is about 14625.9676261094. The cubic root of 213918929 is about 598.0668607173.

The spelling of 213918929 in words is "two hundred thirteen million, nine hundred eighteen thousand, nine hundred twenty-nine".