213988444 has 12 divisors (see below), whose sum is σ = 377980344. Its totient is φ = 105994064.

The previous prime is 213988433. The next prime is 213988447. The reversal of 213988444 is 444889312.

It is a super-2 number, since 2×213988444² = 91582108331082272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 213988444.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213988447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249559 + ... + 250414.

It is an arithmetic number, because the mean of its divisors is an integer number (31498362).

Almost surely, 2^213988444 is an apocalyptic number.

It is an amenable number.

213988444 is a deficient number, since it is larger than the sum of its proper divisors (163991900).

213988444 is a wasteful number, since it uses less digits than its factorization.

213988444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500084 (or 500082 counting only the distinct ones).

The product of its digits is 221184, while the sum is 43.

The square root of 213988444 is about 14628.3438570468. The cubic root of 213988444 is about 598.1316362150.

The spelling of 213988444 in words is "two hundred thirteen million, nine hundred eighty-eight thousand, four hundred forty-four".