1940098891 has 4 divisors (see below), whose sum is σ = 1945385632. Its totient is φ = 1934812152.

The previous prime is 1940098889. The next prime is 1940098913. The reversal of 1940098891 is 1988900491.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1940098891 - 2¹ = 1940098889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1940098841) 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, 2642820 + ... + 2643553.

It is an arithmetic number, because the mean of its divisors is an integer number (486346408).

Almost surely, 2^1940098891 is an apocalyptic number.

1940098891 is a deficient number, since it is larger than the sum of its proper divisors (5286741).

1940098891 is an equidigital number, since it uses as much as digits as its factorization.

1940098891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5286740.

The product of its (nonzero) digits is 186624, while the sum is 49.

The square root of 1940098891 is about 44046.5536790337. The cubic root of 1940098891 is about 1247.2148959116.

The spelling of 1940098891 in words is "one billion, nine hundred forty million, ninety-eight thousand, eight hundred ninety-one".