1920073897 has 4 divisors (see below), whose sum is σ = 2194370176. Its totient is φ = 1645777620.

The previous prime is 1920073781. The next prime is 1920073901. The reversal of 1920073897 is 7983700291.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1920073897 - 2¹⁵ = 1920041129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1920073697) 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, 137148129 + ... + 137148142.

It is an arithmetic number, because the mean of its divisors is an integer number (548592544).

Almost surely, 2^1920073897 is an apocalyptic number.

It is an amenable number.

1920073897 is a deficient number, since it is larger than the sum of its proper divisors (274296279).

1920073897 is an equidigital number, since it uses as much as digits as its factorization.

1920073897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274296278.

The product of its (nonzero) digits is 190512, while the sum is 46.

The square root of 1920073897 is about 43818.6478225880. The cubic root of 1920073897 is about 1242.9089476742.

The spelling of 1920073897 in words is "one billion, nine hundred twenty million, seventy-three thousand, eight hundred ninety-seven".