219139904 has 14 divisors (see below), whose sum is σ = 434855874. Its totient is φ = 109569920.

The previous prime is 219139903. The next prime is 219139919. The reversal of 219139904 is 409931912.

219139904 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 205062400 + 14077504 = 14320^2 + 3752^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (219139903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1711967 + ... + 1712094.

Almost surely, 2^219139904 is an apocalyptic number.

It is an amenable number.

219139904 is a deficient number, since it is larger than the sum of its proper divisors (215715970).

219139904 is an equidigital number, since it uses as much as digits as its factorization.

219139904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3424073 (or 3424063 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 219139904 is about 14803.3747503736. The cubic root of 219139904 is about 602.8933436950.

The spelling of 219139904 in words is "two hundred nineteen million, one hundred thirty-nine thousand, nine hundred four".