1920738887 has 4 divisors (see below), whose sum is σ = 1923263616. Its totient is φ = 1918214160.

The previous prime is 1920738881. The next prime is 1920738913. The reversal of 1920738887 is 7888370291.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7888370291 = 73 ⋅108059867.

It is a cyclic number.

It is not a de Polignac number, because 1920738887 - 2⁴ = 1920738871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920738881) 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, 1261223 + ... + 1262744.

It is an arithmetic number, because the mean of its divisors is an integer number (480815904).

Almost surely, 2^1920738887 is an apocalyptic number.

1920738887 is a deficient number, since it is larger than the sum of its proper divisors (2524729).

1920738887 is an equidigital number, since it uses as much as digits as its factorization.

1920738887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2524728.

The product of its (nonzero) digits is 1354752, while the sum is 53.

The square root of 1920738887 is about 43826.2351451730. The cubic root of 1920738887 is about 1243.0524189963.

The spelling of 1920738887 in words is "one billion, nine hundred twenty million, seven hundred thirty-eight thousand, eight hundred eighty-seven".