1920868965 has 64 divisors (see below), whose sum is σ = 3539896320. Its totient is φ = 987240960.

The previous prime is 1920868931. The next prime is 1920868967. The reversal of 1920868965 is 5698680291.

It is a happy number.

It is not a de Polignac number, because 1920868965 - 2⁷ = 1920868837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920868967) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1158417 + ... + 1160073.

It is an arithmetic number, because the mean of its divisors is an integer number (55310880).

Almost surely, 2^1920868965 is an apocalyptic number.

1920868965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1920868965 is a deficient number, since it is larger than the sum of its proper divisors (1619027355).

1920868965 is a wasteful number, since it uses less digits than its factorization.

1920868965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1979 (or 1973 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The square root of 1920868965 is about 43827.7191398320. The cubic root of 1920868965 is about 1243.0804793995.

The spelling of 1920868965 in words is "one billion, nine hundred twenty million, eight hundred sixty-eight thousand, nine hundred sixty-five".