190398704409 has 27 divisors (see below), whose sum is σ = 285636570037. Its totient is φ = 126908906868.

The previous prime is 190398704407. The next prime is 190398704453. The reversal of 190398704409 is 904407893091.

The square root of 190398704409 is 436347.

It is a perfect power (a square), and thus also a powerful number.

190398704409 is a `hidden beast` number, since 1 + 90 + 39 + 87 + 0 + 440 + 9 = 666.

It is a tau number, because it is divible by the number of its divisors (27).

It is not a de Polignac number, because 190398704409 - 2¹ = 190398704407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190398704407) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 35341414 + ... + 35346800.

Almost surely, 2^190398704409 is an apocalyptic number.

190398704409 is the 436347-th square number.

190398704409 is the 218174-th centered octagonal number.

It is an amenable number.

190398704409 is a deficient number, since it is larger than the sum of its proper divisors (95237865628).

190398704409 is an frugal number, since it uses more digits than its factorization.

190398704409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10798 (or 5390 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 190398704409 in words is "one hundred ninety billion, three hundred ninety-eight million, seven hundred four thousand, four hundred nine".