219040387 has 4 divisors (see below), whose sum is σ = 219289896. Its totient is φ = 218790880.

The previous prime is 219040313. The next prime is 219040399. The reversal of 219040387 is 783040912.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 219040387 - 2¹⁵ = 219007619 is a prime.

It is a super-2 number, since 2×219040387² = 95957382274219538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (219040687) 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, 123433 + ... + 125194.

It is an arithmetic number, because the mean of its divisors is an integer number (54822474).

Almost surely, 2^219040387 is an apocalyptic number.

219040387 is a deficient number, since it is larger than the sum of its proper divisors (249509).

219040387 is an equidigital number, since it uses as much as digits as its factorization.

219040387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249508.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 219040387 is about 14800.0130743185. The cubic root of 219040387 is about 602.8020668131.

The spelling of 219040387 in words is "two hundred nineteen million, forty thousand, three hundred eighty-seven".