1939092921 has 6 divisors (see below), whose sum is σ = 2800912010. Its totient is φ = 1292728608.

The previous prime is 1939092889. The next prime is 1939092943. The reversal of 1939092921 is 1292909391.

It can be written as a sum of positive squares in only one way, i.e., 1747658025 + 191434896 = 41805^2 + 13836^2 .

It is not a de Polignac number, because 1939092921 - 2⁵ = 1939092889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1939092121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 107727376 + ... + 107727393.

Almost surely, 2^1939092921 is an apocalyptic number.

It is an amenable number.

1939092921 is a deficient number, since it is larger than the sum of its proper divisors (861819089).

1939092921 is a wasteful number, since it uses less digits than its factorization.

1939092921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215454775 (or 215454772 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 45.

The square root of 1939092921 is about 44035.1328032515. The cubic root of 1939092921 is about 1246.9992921795. Note that the first 3 decimals are identical.

The spelling of 1939092921 in words is "one billion, nine hundred thirty-nine million, ninety-two thousand, nine hundred twenty-one".