190408891 has 16 divisors (see below), whose sum is σ = 207277056. Its totient is φ = 174222976.

The previous prime is 190408873. The next prime is 190408901. The reversal of 190408891 is 198804091.

It is a cyclic number.

It is not a de Polignac number, because 190408891 - 2¹³ = 190400699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (190408811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132720 + ... + 134146.

It is an arithmetic number, because the mean of its divisors is an integer number (12954816).

Almost surely, 2^190408891 is an apocalyptic number.

190408891 is a deficient number, since it is larger than the sum of its proper divisors (16868165).

190408891 is a wasteful number, since it uses less digits than its factorization.

190408891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 190408891 is about 13798.8728162847. The cubic root of 190408891 is about 575.3018110572.

The spelling of 190408891 in words is "one hundred ninety million, four hundred eight thousand, eight hundred ninety-one".