1982905897 has 4 divisors (see below), whose sum is σ = 2266178176. Its totient is φ = 1699633620.

The previous prime is 1982905871. The next prime is 1982905909. The reversal of 1982905897 is 7985092891.

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: 7985092891 = 607 ⋅13155013.

It is a cyclic number.

It is not a de Polignac number, because 1982905897 - 2¹⁵ = 1982873129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1982905867) 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, 141636129 + ... + 141636142.

It is an arithmetic number, because the mean of its divisors is an integer number (566544544).

Almost surely, 2^1982905897 is an apocalyptic number.

It is an amenable number.

1982905897 is a deficient number, since it is larger than the sum of its proper divisors (283272279).

1982905897 is an equidigital number, since it uses as much as digits as its factorization.

1982905897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283272278.

The product of its (nonzero) digits is 3265920, while the sum is 58.

The square root of 1982905897 is about 44529.8315402158. The cubic root of 1982905897 is about 1256.3212377051.

The spelling of 1982905897 in words is "one billion, nine hundred eighty-two million, nine hundred five thousand, eight hundred ninety-seven".