1920208969 has 4 divisors (see below), whose sum is σ = 2194524544. Its totient is φ = 1645893396.

The previous prime is 1920208963. The next prime is 1920209003. The reversal of 1920208969 is 9698020291.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9698020291 = 163 ⋅59497057.

It is not a de Polignac number, because 1920208969 - 2⁵ = 1920208937 is a prime.

It is a super-2 number, since 2×1920208969² = 7374404969256085922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1920208963) 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, 137157777 + ... + 137157790.

It is an arithmetic number, because the mean of its divisors is an integer number (548631136).

Almost surely, 2^1920208969 is an apocalyptic number.

It is an amenable number.

1920208969 is a deficient number, since it is larger than the sum of its proper divisors (274315575).

1920208969 is an equidigital number, since it uses as much as digits as its factorization.

1920208969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274315574.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 1920208969 is about 43820.1890571002. The cubic root of 1920208969 is about 1242.9380920839.

The spelling of 1920208969 in words is "one billion, nine hundred twenty million, two hundred eight thousand, nine hundred sixty-nine".