190034821 has 2 divisors, whose sum is σ = 190034822. Its totient is φ = 190034820.

The previous prime is 190034797. The next prime is 190034863. The reversal of 190034821 is 128430091.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187964100 + 2070721 = 13710^2 + 1439^2 .

It is a cyclic number.

It is not a de Polignac number, because 190034821 - 2²⁷ = 55817093 is a prime.

It is a super-2 number, since 2×190034821² = 72226466385004082, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 190034821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190034321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95017410 + 95017411.

It is an arithmetic number, because the mean of its divisors is an integer number (95017411).

Almost surely, 2^190034821 is an apocalyptic number.

It is an amenable number.

190034821 is a deficient number, since it is larger than the sum of its proper divisors (1).

190034821 is an equidigital number, since it uses as much as digits as its factorization.

190034821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 190034821 is about 13785.3117846496. The cubic root of 190034821 is about 574.9248254589.

The spelling of 190034821 in words is "one hundred ninety million, thirty-four thousand, eight hundred twenty-one".