1921893941 has 12 divisors (see below), whose sum is σ = 2113775916. Its totient is φ = 1746117120.

The previous prime is 1921893937. The next prime is 1921893971. The reversal of 1921893941 is 1493981291.

It can be written as a sum of positive squares in 2 ways, for example, as 747803716 + 1174090225 = 27346^2 + 34265^2 .

It is not a de Polignac number, because 1921893941 - 2² = 1921893937 is a prime.

It is a super-2 number, since 2×1921893941² = 7387352640905022962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921893971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 251915 + ... + 259431.

It is an arithmetic number, because the mean of its divisors is an integer number (176147993).

Almost surely, 2^1921893941 is an apocalyptic number.

1921893941 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1921893941 is a deficient number, since it is larger than the sum of its proper divisors (191881975).

1921893941 is a wasteful number, since it uses less digits than its factorization.

1921893941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9652 (or 9641 counting only the distinct ones).

The product of its digits is 139968, while the sum is 47.

The square root of 1921893941 is about 43839.4108194898. The cubic root of 1921893941 is about 1243.3015427347.

The spelling of 1921893941 in words is "one billion, nine hundred twenty-one million, eight hundred ninety-three thousand, nine hundred forty-one".