190921689 has 48 divisors (see below), whose sum is σ = 335712000. Its totient is φ = 104315904.

The previous prime is 190921681. The next prime is 190921697. The reversal of 190921689 is 986129091.

It is an interprime number because it is at equal distance from previous prime (190921681) and next prime (190921697).

It is not a de Polignac number, because 190921689 - 2³ = 190921681 is a prime.

It is a super-2 number, since 2×190921689² = 72902182661225442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (190921681) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 69657 + ... + 72345.

It is an arithmetic number, because the mean of its divisors is an integer number (6994000).

Almost surely, 2^190921689 is an apocalyptic number.

It is an amenable number.

190921689 is a deficient number, since it is larger than the sum of its proper divisors (144790311).

190921689 is a wasteful number, since it uses less digits than its factorization.

190921689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2739 (or 2722 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 45.

The square root of 190921689 is about 13817.4414780740. The cubic root of 190921689 is about 575.8178044270.

The spelling of 190921689 in words is "one hundred ninety million, nine hundred twenty-one thousand, six hundred eighty-nine".