219491964 has 48 divisors (see below), whose sum is σ = 602532000. Its totient is φ = 68859648.

The previous prime is 219491963. The next prime is 219491999. The reversal of 219491964 is 469194912.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (219491963) 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, 57939 + ... + 61610.

It is an arithmetic number, because the mean of its divisors is an integer number (12552750).

Almost surely, 2^219491964 is an apocalyptic number.

It is an amenable number.

219491964 is an abundant number, since it is smaller than the sum of its proper divisors (383040036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

219491964 is a wasteful number, since it uses less digits than its factorization.

219491964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119579 (or 119571 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 219491964 is about 14815.2611856828. The cubic root of 219491964 is about 603.2160311075.

The spelling of 219491964 in words is "two hundred nineteen million, four hundred ninety-one thousand, nine hundred sixty-four".