1977203897 has 4 divisors (see below), whose sum is σ = 2081267280. Its totient is φ = 1873140516.

The previous prime is 1977203873. The next prime is 1977203903. The reversal of 1977203897 is 7983027791.

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: 7983027791 = 9587 ⋅832693.

It is a cyclic number.

It is not a de Polignac number, because 1977203897 - 2²⁴ = 1960426681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1977203807) 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, 52031663 + ... + 52031700.

It is an arithmetic number, because the mean of its divisors is an integer number (520316820).

Almost surely, 2^1977203897 is an apocalyptic number.

It is an amenable number.

1977203897 is a deficient number, since it is larger than the sum of its proper divisors (104063383).

1977203897 is a wasteful number, since it uses less digits than its factorization.

1977203897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104063382.

The product of its (nonzero) digits is 1333584, while the sum is 53.

The square root of 1977203897 is about 44465.7609515456. The cubic root of 1977203897 is about 1255.1158651353.

The spelling of 1977203897 in words is "one billion, nine hundred seventy-seven million, two hundred three thousand, eight hundred ninety-seven".