20190439 has 2 divisors, whose sum is σ = 20190440. Its totient is φ = 20190438.

The previous prime is 20190433. The next prime is 20190461. The reversal of 20190439 is 93409102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20190439 - 2⁹ = 20189927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20190433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10095219 + 10095220.

It is an arithmetic number, because the mean of its divisors is an integer number (10095220).

Almost surely, 2^20190439 is an apocalyptic number.

20190439 is a deficient number, since it is larger than the sum of its proper divisors (1).

20190439 is an equidigital number, since it uses as much as digits as its factorization.

20190439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 20190439 is about 4493.3772376688. The cubic root of 20190439 is about 272.3005931110.

The spelling of 20190439 in words is "twenty million, one hundred ninety thousand, four hundred thirty-nine".