1881992939 has 4 divisors (see below), whose sum is σ = 1992698424. Its totient is φ = 1771287456.

The previous prime is 1881992899. The next prime is 1881992951. The reversal of 1881992939 is 9392991881.

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 1881992939 - 2⁸ = 1881992683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1881992969) 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, 55352717 + ... + 55352750.

It is an arithmetic number, because the mean of its divisors is an integer number (498174606).

Almost surely, 2^1881992939 is an apocalyptic number.

1881992939 is a deficient number, since it is larger than the sum of its proper divisors (110705485).

1881992939 is a wasteful number, since it uses less digits than its factorization.

1881992939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110705484.

The product of its digits is 2519424, while the sum is 59.

The square root of 1881992939 is about 43381.9425452572. The cubic root of 1881992939 is about 1234.6371193681.

The spelling of 1881992939 in words is "one billion, eight hundred eighty-one million, nine hundred ninety-two thousand, nine hundred thirty-nine".