219139428 has 24 divisors (see below), whose sum is σ = 528958080. Its totient is φ = 70527520.

The previous prime is 219139411. The next prime is 219139429. The reversal of 219139428 is 824931912.

It is not an unprimeable number, because it can be changed into a prime (219139429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 314508 + ... + 315203.

It is an arithmetic number, because the mean of its divisors is an integer number (22039920).

Almost surely, 2^219139428 is an apocalyptic number.

It is an amenable number.

219139428 is an abundant number, since it is smaller than the sum of its proper divisors (309818652).

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

219139428 is a wasteful number, since it uses less digits than its factorization.

219139428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629747 (or 629745 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 219139428 is about 14803.3586729499. The cubic root of 219139428 is about 602.8929071741.

The spelling of 219139428 in words is "two hundred nineteen million, one hundred thirty-nine thousand, four hundred twenty-eight".