190905930 has 64 divisors (see below), whose sum is σ = 510779520. Its totient is φ = 50738688.

The previous prime is 190905919. The next prime is 190905943. The reversal of 190905930 is 39509091.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94309 + ... + 96311.

It is an arithmetic number, because the mean of its divisors is an integer number (7980930).

Almost surely, 2^190905930 is an apocalyptic number.

190905930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 190905930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255389760).

190905930 is an abundant number, since it is smaller than the sum of its proper divisors (319873590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

190905930 is a wasteful number, since it uses less digits than its factorization.

190905930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2372 (or 2366 counting only the distinct ones).

The product of its (nonzero) digits is 10935, while the sum is 36.

The square root of 190905930 is about 13816.8712087795. The cubic root of 190905930 is about 575.8019609983.

The spelling of 190905930 in words is "one hundred ninety million, nine hundred five thousand, nine hundred thirty".