190905856 has 40 divisors (see below), whose sum is σ = 382692024. Its totient is φ = 95139840.

The previous prime is 190905851. The next prime is 190905859. The reversal of 190905856 is 658509091.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190905851) 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, 292026 + ... + 292678.

Almost surely, 2^190905856 is an apocalyptic number.

190905856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 190905856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191346012).

190905856 is an abundant number, since it is smaller than the sum of its proper divisors (191786168).

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

190905856 is an frugal number, since it uses more digits than its factorization.

190905856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242 (or 1226 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 190905856 is about 13816.8685308937. The cubic root of 190905856 is about 575.8018865998.

The spelling of 190905856 in words is "one hundred ninety million, nine hundred five thousand, eight hundred fifty-six".