219981964 has 6 divisors (see below), whose sum is σ = 384968444. Its totient is φ = 109990980.

The previous prime is 219981911. The next prime is 219981967. The reversal of 219981964 is 469189912.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (219981967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27497742 + ... + 27497749.

Almost surely, 2^219981964 is an apocalyptic number.

It is an amenable number.

219981964 is a deficient number, since it is larger than the sum of its proper divisors (164986480).

219981964 is a wasteful number, since it uses less digits than its factorization.

219981964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54995495 (or 54995493 counting only the distinct ones).

The product of its digits is 279936, while the sum is 49.

The square root of 219981964 is about 14831.7889682937. The cubic root of 219981964 is about 603.6645762716.

The spelling of 219981964 in words is "two hundred nineteen million, nine hundred eighty-one thousand, nine hundred sixty-four".